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Dr. Regina Zambrano DiFiore, DO

Board-Certified Dermatologist | Medical, Pediatric & Cosmetic Dermatology

Dr. Regina Zambrano DiFiore is a board-certified dermatologist at the Skin Institute of New York (SINY®), providing comprehensive dermatologic care at the Massapequa, Long Island location. Born and raised on the South Shore of Long Island, Dr. Zambrano DiFiore is proud to serve the community she calls home, caring for patients of all ages with a compassionate, highly personalized approach.

She is trained in medical, pediatric, and cosmetic dermatology, with advanced experience treating all skin types. Patients appreciate her thorough evaluations, clear communication, and commitment to developing treatment plans that align with each individual’s needs and goals.

Schedule an Appointment with Dr. Zambrano DiFiore

Education & Training

Dr. Zambrano DiFiore’s academic excellence and leadership background reflect her dedication to high-quality, evidence-based dermatologic care:

• Bachelor of Science in Biology (Honors) – Stony Brook University
  Specialization: Developmental Genetics
• Doctor of Osteopathic Medicine (DO) – Nova Southeastern University, Fort Lauderdale, FL
• Master of Public Health (MPH) – Nova Southeastern University
• Internship & Dermatology Residency – St. John’s Episcopal Hospital
  Chief Resident, Final Year

Her dual medical and public health training allows Dr. Zambrano DiFiore to approach dermatology with a broad, patient-centered perspective that emphasizes both treatment and long-term skin health.

Clinical Expertise & Special Interests

Dr. Zambrano DiFiore provides comprehensive care for conditions affecting the skin, hair, and nails, including both common and complex dermatologic concerns. Her areas of focus include:

• Medical dermatology for acute and chronic skin conditions
• Pediatric dermatology
• Skin cancer screening and early detection
• Hair and scalp disorders
• Nail conditions
• Cosmetic dermatology, including:
• Neurotoxins (Botox® and similar treatments)
• Dermal fillers

With a thoughtful, minimalistic approach to aesthetics, she focuses on enhancing her patients’ natural beauty—creating treatment plans that are subtle, balanced, and tailored to individual goals. Her philosophy centers on helping patients look refreshed, confident, and like the best version of themselves.

Patient-Centered Philosophy

Dr. Zambrano DiFiore is deeply committed to building long-term relationships with her patients. She strives to create an approachable, supportive environment where patients feel heard, respected, and actively involved in their care.

She is passionate about patient education, empowering individuals to understand their conditions and treatment options so they can confidently participate in their dermatologic journey. Dr. Zambrano DiFiore remains actively engaged with the latest advancements in dermatology to ensure her patients receive safe, effective, and innovative care.

Patient Experience & Satisfaction

Patients consistently describe Dr. Zambrano DiFiore as attentive, knowledgeable, and genuinely caring. Many highlight her ability to listen closely, explain treatment options clearly, and follow up personally to ensure optimal outcomes.

Convenient Location in Long Island

Dr. Zambrano DiFiore sees patients at the SINY Dermatology Massapequa office, serving families and individuals throughout the South Shore of Long Island.

Massapequa, Long Island

83A Grand Ave, Massapequa, NY 11758

Phone: 800-778-3090

Hours:

• Mon, Thu & Fri: 9:00 AM – 5:00 PM
• Tue: 12:00 PM – 8:00 PM
• Wed: Closed
• Sat: By appointment
• Sun: Closed

Serving patients from: Massapequa, Massapequa Park, Seaford, Wantagh, Bellmore, Amityville, Farmingdale, and surrounding Long Island communities.

Schedule an Appointment at Massapequa

Accepted Insurance Plans

Dr. Zambrano DiFiore accepts many major insurance plans commonly used throughout Long Island and New York, including:

• Aetna
• Anthem Blue Cross Blue Shield / Empire Blue Cross Blue Shield
• Blue Cross Blue Shield
• Cigna & Cigna-HealthSpring
• UnitedHealthcare & Oxford
• EmblemHealth (GHI)
• Healthfirst (NY)
• Medicare
• Humana
• Fidelis Care (NY)
• AvMed
• 1199SEIU
• Multiplan PHCS

Additional plans may be accepted. Please contact SINY Dermatology to confirm coverage prior to your visit.

About SINY Dermatology (Skin Institute of New York)

The Skin Institute of New York (SINY®) is a leading dermatology group providing medical, surgical, and cosmetic dermatology services across New York. SINY Dermatology physicians combine academic excellence, advanced clinical training, and patient-focused care to deliver high-quality, individualized treatment for every patient.

Dr. Peter Saitta, DO

Board-Certified Dermatologist | Acne, Hair Loss & Medical Dermatology Specialist

Dr. Peter Saitta is a highly regarded board-certified dermatologist at the Skin Institute of New York (SINY Dermatology), known nationally and internationally for his expertise in acne, hair loss, contact dermatitis, and complex medical dermatology. He treats both adult and pediatric patients, combining advanced clinical research experience with compassionate, patient-centered care.

Schedule an Appointment with Dr. Saitta

Education & Training

Dr. Saitta’s academic background and leadership training distinguish him as a leader in modern dermatology:

• Bachelor of Arts – New York University (NYU)
• Doctor of Osteopathic Medicine – University of Medicine and Dentistry of New Jersey
• Dermatology Residency (Chief Resident) – Affiliated with Michigan State University
• Recipient of national awards for leadership and academic excellence

During his residency, Dr. Saitta trained under a world-recognized authority in acne, where he also served as Clinical Research Director on multiple acne treatment studies. His work contributed to the development and refinement of some of the most advanced acne therapies available today—innovations he now brings directly to his patients at SINY Dermatology.

Clinical Expertise & Special Interests

Dr. Saitta provides comprehensive medical dermatology care with particular focus on:

• Acne treatment (teen and adult acne, hormonal acne, treatment-resistant acne)
• Hair loss and scalp disorders
• Contact dermatitis and complex rashes
• Hand, face, and scalp rashes
• Skin cancer screening, diagnosis, and treatment
• Pediatric dermatology

Research, Publications & National Leadership

Dr. Saitta is deeply involved in advancing the field of dermatology through research, education, and professional leadership:

• Member, American Osteopathic College of Dermatology
• National committee member, Dermatology Resident In-Service Examination
• Recognized author and subject-matter leader in contact dermatitis in the Yearbook of Dermatology
• International lecturer on acne, hair loss, and the psychological effects of skin disease
• Author of numerous peer-reviewed publications, many widely available online

He is also joining the Dermatology Residency Program at St. Barnabas Hospital in New York, where he will help train the next generation of dermatologists.

Patient Experience & Satisfaction

Patients frequently highlight Dr. Saitta’s thorough approach, clear communication, and ability to treat complex or long-standing skin concerns with leading-edge yet practical solutions.

 

Convenient Locations in New York

Dr. Saitta sees patients at multiple SINY Dermatology locations across Brooklyn and Long Island, providing convenient access to expert dermatologic care for surrounding neighborhoods and communities. Patients can easily request an appointment with Dr. Peter Saitta online using the location scheduling links below.

Bay Ridge, Brooklyn

7901 4th Ave, Brooklyn, NY 11209

Phone: 800-778-3090

Hours:

• Mon-Thu: 9:00 AM – 8:00 PM
• Fri: 9:00 AM – 6:30 PM
• Sat: 9:00 AM – 3:00 PM
• Sun: 9:00 AM – 2:00 PM

Serving patients from: Bay Ridge, Dyker Heights, Bensonhurst, Sunset Park, Fort Hamilton, Staten Island, and surrounding South Brooklyn communities.

Schedule an Appointment at Bay Ridge

Park Slope, Brooklyn

76 7th Ave, Brooklyn, NY 11217

Phone: 800-778-3090

Hours:

• Mon-Tue: 9:00 AM – 8:00 PM
• Wed-Thu: 8:00 AM – 8:00 PM
• Fri: 9:00 AM – 7:00 PM
• Sat: 9:00 AM – 5:00 PM
• Sun: 10:00 AM – 3:00 PM

Serving patients from: Park Slope, Prospect Heights, Gowanus, Boerum Hill, Carroll Gardens, Cobble Hill, Downtown Brooklyn, and surrounding neighborhoods.

Schedule an Appointment at Park Slope

Southold, Long Island

56850 Main Rd, Southold, NY 11971

Phone: 800-778-3090

Hours:

• Mon: Closed
• Tue-Wed: 9:00 AM – 8:00 PM
• Thu: 9:00 AM – 7:00 PM
• Fri: Closed
• Sat: 9:00 AM – 3:00 PM
• Sun: Closed

Serving patients from: Southold, Greenport, Mattituck, Cutchogue, Orient, Riverhead, and North Fork Long Island communities.

Schedule an Appointment at Southold

Accepted Insurance Plans

Dr. Saitta accepts a wide range of major insurance plans, including:

• Aetna
• Anthem Blue Cross Blue Shield / Empire Blue Cross Blue Shield
• Blue Cross Blue Shield (including Federal Employee Program)
• Cigna & Cigna-HealthSpring
• UnitedHealthcare & Oxford
• EmblemHealth (GHI)
• Healthfirst (NY)
• Medicare
• Humana
• Fidelis Care (NY)
• Oscar Health
• MetroPlus Health Plan
• 1199SEIU

Additional plans accepted. Please contact SINY Dermatology to confirm coverage prior to your visit.

About SINY Dermatology (Skin Institute of New York)

The Skin Institute of New York is a leading dermatology group providing medical, surgical, and cosmetic dermatology services across New York. SINY Dermatology physicians combine academic excellence, clinical research, and patient-focused care to deliver advanced skin treatments tailored to each individual.

Yelena Vevitsis is a licensed Physician Assistant, who received her bachelor of science degree in biology from Pace University and completed her Physician Assistant program at NYC Pace University-Lenox Hill Hospital. She has been practicing Dermatology for more than 20 years.

Yelena diagnoses and treats many dermatological conditions including, acne, rosacea, eczema, psoriasis, pre-cancer and skin cancers, warts, severe sweating, and various skin rashes. She performs lesion removals, biopsies, and skin cancer screenings.

Yelena’s reputation is not only defined by her work but also by her caring, dedication, and compassion for her patients.

Office Hours

Tuesday: 12.00 pm - 6.00 pm, Wednesday, Thursday: 10:00 am – 6:00 pm

 

Eyal Levit, MD, is a board-certified dermatologist at Levit Dermatology in the Manhattan Beach area of Brooklyn, New York. 

Dr. Levit completed his residency at Columbia Presbyterian Hospital, now New York Presbyterian Hospital, in 1999. In recognition of his exceptional skill, he received additional fellowship training at the University of Pennsylvania in Philadelphia. Here, he studied rigorously in Mohs, laser, and dermatologic surgery. 

Following his surgical fellowship, Dr. Levit completed a two-year fellowship in cosmetic dermatology. He presented nationally and internationally through his studies on laser resurfacing, liposuction, fat injections, facelifts, blepharoplasty, acne therapy, and scar revisions. 

His last international presentation was in Spain in June of 2016, where he was a keynote speaker during the World Congress of Cosmetic Dermatology. He presented his inventions in cutting-edge acne therapy and blepharoplasty and described his nonsurgical nose and facial rejuvenation techniques.

Dr. Levit is excited to welcome new and returning patients to his practice.

Dr. Eyal Levit has served for 15 years as the director of Cosmetic and dermatologic surgery at St. Luke’s Hospital, Mount Sinai medical center, and received the distinguished award for best teacher of the year award for his contribution in that field.

Dr. Levit is highly recognized as an expert in the cosmetic surgery field and was selected by the ASDS (American Society of Dermatologic Surgery) as a fellowship training center for other board-certified dermatologists who want to take an additional year to improve and learn cutting-edge techniques for cosmetic procedures.

Dr. Levit performs hundreds of skin cancer surgeries a year and brings his vast dermatologic knowledge and experience of cosmetic surgery into his patient medical and cosmetic reconstruction and vis versa, his vast suturing experience techniques to his cosmetic surgeries, helping his patients feel and look better.

Dr. Levit is the primary author and creator of the ABC rules to diagnose nail melanoma published by the JAAD in 2000.

Outside of his professional career he has also authored books for both adults and children: “A Lost Art” where he describes his experience in dermatology in an educational amusing and inspiring way to the lay public. In his most recent book “The King’s Race” his vivid imagination and life experience uses animals to help heal, inspire, and improve hope and acceptance in our stereotype-riddled society. Among his hobbies, he has written songs (both lyrics & music) performing some of them in children's charity and other regional settings.

Dr. Levit believes that medicine & surgery are like all other fields (teaching, car repair, shoe sales) they begin and end with the person providing them. Once they are qualified it is not how smart they are but how much they want to make a difference and help those seeking their assistance, this is truly what makes the difference.

Office Hours

Monday, Tuesday, Wednesday, Thursday: 8:30 am – 6:00 pm

 Friday: 9:00 am – 2:00 pm

Dr. Eckman established his private practice in 2001 and opened the Towson Dermatology & Cosmetic Center in 2006 to provide innovative and comprehensive dermatologic and skin care to his patients. Dr. Eckman's expertise includes the detection and management of skin cancer and the treatment of skin disorders in both pediatric and adult patients. Dr. Eckman has participated in skin cancer screenings for the Baltimore Orioles in combination with the American Academy of Dermatology Play it Safe in the Sun program and has been a sought after speaker on the topic of skin cancer detection and prevention. Dr. Eckman has recently relocated to Long Island and has established his new practice in Rockville Centre, NY. He looks forward to providing the same level of care and expertise to his patients in his new practice as he provided during his tenure serving as an Assistant Professor of Dermatology at Johns Hopkins Hospital for nearly twenty years.

Theresa Durchhalter, DO, is a board-certified dermatologist serving patients at Allure Dermatology in Hicksville, New York. She specializes in general and cosmetic dermatology and has experience treating adult and pediatric patients with a wide array of skin disorders, including acne, psoriasis, atopic dermatitis, alopecia, and skin cancers. 

Dr. Durchhalter is a native of Long Island, New York, with a long-standing commitment to her community. She graduated Magna cum Laude from Adelphi University in Garden City, New York, with a bachelor’s degree in biochemistry. 

In 2016, Dr. Durchhalter obtained her medical degree from Edward Via College of Osteopathic Medicine in Blacksburg, Virginia, where she graduated as a member of the Sigma Sigma Phi honors fraternity. Upon completion, she returned to New York to complete her dermatology residency at St. John’s Episcopal, where she was appointed chief resident. 

Dr. Durchhalter believes in a personalized, hands-on approach to patient care, utilizing her osteopathic skills to treat the entire body. She also takes pride in treating each patient as if they are family, creating a warm, trusting, and individualized environment. 

Dr. Durchhalter is an active member of various organizations, including the American Academy of Dermatology, the American Osteopathic College of Dermatology, and the American Medical Association.

Joanna Trigg DO is a Board Certified Dermatologist who treats both adult and pediatric patients. She is a native New Yorker who grew up in Brooklyn and attended Bishop Kearney High School. After graduating summa cum laude and earning a bachelor’s degree in biology with minors in chemistry and psychology from Wagner College, Dr. Trigg received her medical degree from NYIT College of Osteopathic Medicine in Old Westbury, NY. She then completed her residency at St. John’s Episcopal Hospital in Queens, New York in affiliation with Lake Erie College of Osteopathic Medicine.

During her residency, Dr. Trigg attended, presented and lectured at many conferences. She also served as Chief Dermatology resident during the final year. Training in New York City gave her exposure to a very large and diverse patient population.

Dr. Trigg is an active member of the American Academy of Dermatology, the American College of Osteopathic Medicine. and the American Society for Dermatologic Surgery. She is a Diplomate of the American Board of Dermatology and enjoys medical, surgical, and cosmetic dermatology, with her expertise in acne, rosacea and skin cancer screenings. Dr. Trigg enjoys working with her patients to provide a comprehensive and individualized treatment plan for all their needs!  

Christos Dimitris Zouzias, MD, MBA, is a board-certified dermatologist and fellowship-trained Mohs Micrographic Surgeon at MDCS Dermatology. Dr. Zouzias specializes in procedural dermatology, skin cancer management, and Mohs micrographic surgery, offering personalized and patient-centered care to ensure the best outcomes for his patients. He serves patients at MDCS Dermatology's Long Island locations, including Commack, Hampton Bays, and Plainview.

Dr. Zouzias earned both his Bachelor of Arts and Doctor of Medicine degrees at New York University (NYU) in New York City. He also holds a Master of Business Administration (MBA) from NYU’s Stern School of Business. Prior to medical school, he completed a student research fellowship in supportive oncodermatology, studying the dermatologic side effects of chemotherapy and radiation therapy under the mentorship of Dr. Beth McLellan, the current chief of dermatology at Montefiore Medical Center.

Following his medical degree, Dr. Zouzias completed his internship in internal medicine at North Shore Long Island Jewish Medical Center and his dermatology residency at Albert Einstein College of Medicine/Montefiore Medical Center, where he was recognized as the Outstanding House Officer for his compassion, clinical excellence, and professional rapport. He further specialized by completing his fellowship training in Mohs Micrographic Surgery at Affiliated Dermatologists and Dermatologic Surgeons in New Jersey.

In his free time, Dr. Zouzias enjoys cooking and spending time with his nieces and nephews.

Carolyn Stull, MD, FAAD, is a board-certified dermatologist and fellowship-trained dermatologic surgeon. She treats the full spectrum of dermatologic conditions and specializes in Mohs micrographic surgery, surgical reconstruction following skin cancer removal, and facial aesthetics.

Dr. Stull is originally from Philadelphia and served as an Instructor of Dermatology at the University of Pennsylvania prior to joining MDCS. She earned her undergraduate degree from the University of Miami and her medical degree from Temple University School of Medicine. Dr. Stull completed dermatology residency at Rush University Medical Center in Chicago where she served as chief resident. She subsequently completed a fellowship in Mohs micrographic surgery and dermatologic oncology at the University of Texas M.D. Anderson Cancer Center. During fellowship she trained with experts in the management of rare and advanced skin cancers, complex surgical reconstruction and laser procedures. She also served as a sub-investigator for several clinical trials testing oncolytic viruses and immunotherapies for skin cancer treatment.

Dr. Stull has published numerous articles in peer-reviewed journals including the Journal of the American Academy of Dermatology, JAMA Dermatology and Dermatologic Surgery. She has been an invited speaker at regional and national meetings, and has been awarded grant funding from the University of Pennsylvania Center for Human Appearance and the Pennsylvania Medical Society for medical device innovation. She is a fellow of the American Academy of Dermatology and American Society for Dermatologic Surgery.

Outside of the office Dr. Stull enjoys traveling and spending time with her husband who is plastic surgeon and their daughter.

Lauren Penzi, MD, is an experienced dermatologist with the team at MDCS Dermatology: Medical Dermatology & Cosmetic Surgery. Dr. Penzi welcomes patients at the practice’s locations in Commack, Plainview, and Hampton Bays, New York.

Dr. Penzi completed her bachelor’s degree in biology and mathematical sciences at Loyola University Maryland, where she graduated summa cum laude. She went on to finish her medical degree at New York Medical College in Valhalla, where she was a member of the Alpha Omega Alpha honors society. After graduating, Dr. Penzi completed an internal medicine preliminary internship at NYU Winthrop Hospital in Mineola, New York, before pursuing an alopecia clinical and research fellowship at Massachusetts General Hospital in Boston. She then furthered her training with a dermatology residency at Johns Hopkins Hospital in Baltimore, Maryland.

Dr. Penzi is a member of various academic and professional organizations, including the Phi Beta Kappa Honor Society, American Academy of Dermatology, American Society for Dermatologic Surgery, Society for Pediatric Dermatology, American Society for Laser Medicine & Surgery, and the Women’s Dermatologic Society.

In addition to her clinical training, Dr. Penzi has been published in numerous peer-reviewed medical journals and presented her research findings at various medical conferences and additionally has authored a book chapter on emergency dermatology.

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Dr. Lauren Penzi is a board-certified dermatologist who specializes in medical and cosmetic dermatology. Dr. Penzi’s training and credentials set her apart as a premier dermatologist on Long Island. She attended New York Medical College, where she was admitted to the prestigious Alpha Omega Alpha honor society for graduating in the top 10% of her medical school class. She completed her intern year at NYU Winthrop Hospital and went on to complete her dermatology residency training at the renowned Johns Hopkins Hospital. Additionally, Dr. Penzi also spent a year at Harvard Dermatology for a hair loss fellowship at Massachusetts General Hospital. Throughout her training, Dr. Penzi has made many notable research contributions, and has been published in some of the top dermatology journals including JAMA Dermatology, as well as the Journal of the American Academy of Dermatology. She continues to stay at the forefront of dermatologic education and research in order to provide the best care to her patients.

Dr. Penzi is dedicated to the health and beauty of her patients’ skin. She prioritizes preventative measures to combat both skin cancer and aging. Dr. Penzi treats patients of all ages and has a special interest in acne, rosacea, skin cancer, eczema, psoriasis, and hair loss. She believes in a personalized, comprehensive, and natural approach to cosmetic dermatology. She enjoys performing a wide range of cosmetic procedures including neurotoxins, fillers, platelet rich plasma injections, and cutting-edge laser treatments.

Dr. Penzi was born and raised on Long Island, NY, where she now resides with her husband and son. She is thrilled to be able to practice dermatology in her hometown. Dr. Penzi welcomes patients at the Plainview, Commack, and Hampton Bays locations.

Noah Gratch, MD, FAAD, a board-certified dermatologist, serves patients from throughout Manhattan, Commack, Hampton Bay and Plainview, NY at MDCS Dermatology: Medical Dermatology & Cosmetic Surgery. He provides a wide variety of treatments for acne, eczema, hyperhidrosis, rosacea, psoriasis, and skin cancer as well as procedures including advanced skin cancer treatment such as Mohs Surgery, sclerotherapy, mole removal and cosmetic dermatology services such as Botox®, fillers, and laser treatments.

Dr. Gratch is a graduate of University of California Los Angeles, University of Southern California and Cornell. Following residency, Dr. Gratch became a Clinical Instructor of Dermatology at the Weill Medical College of Cornell University in New York City. Dr. Gratch is a fellow of the American Academy of Dermatology and the American Society of Dermatologic Surgery. 

Patients benefit from Dr. Gratch’s extensive training and experience in dermatology and cosmetic services. He wants to help each and every patient not only look and feel great but maintain the best possible skin health.

Dr. Gratch and his colleagues at MDCS Dermatology: Medical Dermatology & Cosmetic Surgery are currently welcoming new patients and accept most major forms of insurance.

Dr. Gratch has previously served as a Clinical Instructor of Dermatology at the Weill Medical College of Cornell University. He is also an active contributor in the academic world of dermatology, having overseen numerous research projects in cutaneous diseases with published papers and articles in several scientific journals and books.

Dr. Gratch is a fellow of the American Academy of Dermatology and the American Society of Dermatologic Surgery.

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Dr. Ezra Hazan is a board certified dermatologist and fellowship trained Mohs surgeon. He graduated with honors from Jefferson Medical College in Philadelphia, PA. Dr. Hazan went on to do an internship in internal medicine at Maimonides Medical Center in Brooklyn, NY. He then completed his dermatology residency at Thomas Jefferson University Hospital and fellowship in Mohs micrographic surgery and cosmetic dermatology at Mount Sinai Hospital. There he gained extensive knowledge and experience in procedural dermatology, including surgery of the skin as well as advanced cosmetic procedures like injectables, lasers and light based technologies.

Dr. Hazan is on staff at Mount Sinai Hospital, where he helps train dermatology residents, and at Penn Medicine Princeton Medical Center. He has published many academic journal articles and authored multiple textbook chapters on various topics in the field of dermatology. Dr. Hazan is a member of the American Academy of Dermatology, American Society for Dermatologic Surgery and American College of Mohs Surgery. He is passionate about the management and treatment of skin cancers, as well as cosmetic treatments and general dermatologic conditions. He strives to provide personalized quality care to all of his patients.

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Sergey Petrosian DO is a board-certified dermatologist at the Skin Institute of New York (SINY®). Dr. Petrosian treats adult and pediatric patients at three of SINY’s® offices, in the Forest Hills area of Queens as well as the Bay Ridge and Park Slope areas of Brooklyn, New York.

He is a native of New York City who grew up in Queens and attended Brooklyn Technical High School. After earning a bachelor of science degree from SUNY Stony Brook University, Dr. Petrosian received his medical degree from New York College of Osteopathic Medicine (NYCOM/NYITCOM) in Westbury, New York. He then completed his residency at St. John’s Episcopal Hospital in Queens, New York in affiliation with Lake Erie College of Osteopathic Medicine.

Dr. Petrosian attended, presented and lectured at many conferences as a resident, he also received many scholastic accolades in that time. During his residency Dr. Petrosian consistently scored amongst the top percentile in the nation on in-service examinations. He trained with and received mentorship from various experts in many fields of dermatology who practice here in New York City. His training in New York City gave him exposure to a very large and diverse patient population.

Dr. Petrosian is an active member of the American Academy of Dermatology. He enjoys medical dermatology and also spent three years training with a cosmetic dermatologist. Although he provides comprehensive dermatologic treatment for all of his adult and pediatric patients, his special areas of expertise and interest include cosmetic dermatology, acne, hair loss, and skin cancer screening. Dr. Petrosian focuses on treating all of patients like family, providing the highest level of individualized and compassionate care.

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Allison Jaekle is a Board Certified Physician Assistant specializing in medical and cosmetic dermatology. Allison was born and raised locally on Long Island. She attended Binghamton University for her undergraduate degree in History with a concentration in Public Health. She then attended Touro College for a Bachelor of Science in Health Sciences and a Master in Physician Assistant Studies, where she received the Leadership, Academic, and Clinical Achievement awards upon graduation.

She is currently an active member of the American Academy of Physician Assistants, New York State Society of Physician Assistants, and the Society for Dermatology Physician Assistants. Allison has always had a true passion for dermatology and is honored to be part of the SINY Dermatology team. Allison’s main goal is to restore the skin’s natural look of beauty via an individualized care plan for every patient.

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Sydney Liang, MD, is a board-certified dermatologist and fellow of the American Academy of Dermatology. She specializes in medical, cosmetic, and surgical dermatology with an emphasis on delivering compassionate, high quality, and patient-centered care. She has a special interest in the prevention and surgical management of skin cancers, the treatment of acne and acne scarring, rosacea, psoriasis, cosmetic injectables, and laser treatments and resurfacing.

With a strong educational background and rigorous training, Dr. Liang completed her undergraduate degrees in cell biology, genetics, and human development at the University of Maryland, earning early acceptance to the Phi Beta Kappa Honor Society as a Junior and graduating with the highest honors of summa cum laude. While earning her medical degree from New York University School of Medicine in New York City, Dr. Liang was elected as a member of the prestigious Alpha Omega Alpha Medical Honor Society and graduated top of her medical school class. She then completed her residency in dermatology at the Ronald O. Perelman Department of Dermatology at New York University Langone Health. While in residency, Dr. Liang earned multiple awards for academic excellence, leadership, and research and received the Morris Leider MD Award for the “Best All-around Resident” at the end of her training. Dr. Liang’s dedication to continuous learning and staying up-to-date with the latest advancements has enabled her to provide the most cutting-edge and evidence-based treatments to her patients.

Dr. Liang has a distinctive approach that places patients at the forefront. Her empathetic nature and exceptional communication skills create a comfortable environment where patients can openly discuss their dermatologic concerns. Her patient-centered approach ensures that treatment plans are tailored to each individual’s needs, whether addressing complex medical conditions, performing precise surgical procedures, or enhancing natural beauty through cosmetic procedures and interventions. 

When Dr. Liang is not treating patients at SINY® or teaching future dermatologists at New York University School of Medicine, Dr. Liang has presented at many regional and national conferences and has authored numerous scholarly publications in the most prominent dermatology journals. Her commitment to sharing knowledge not only benefits fellow professionals but also underscores her dedication to elevating dermatological care for her patients and patients everywhere.

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Lisa M. Gruson, MD, is a board-certified dermatologist and part of the medical team at the Skin Institute of New York (SINY®). Dr. Gruson practices medical and cosmetic dermatology and performs laser procedures at SINY’s® three offices, one in the West Village area of New York City and the others in the Bay Ridge and Park Slope areas of Brooklyn, New York.

After earning her undergraduate degree at the University of Michigan in Ann Arbor, Michigan, and graduating with Phi Beta Kappa honors, Dr. Gruson received her medical degree from the New York University School of Medicine in New York City. While in medical school, she earned the Marion B. Sulzberger Dermatology Award and membership in the prestigious Alpha Omega Alpha Honor Medical Society. She then completed her dermatology residency at the NYU Medical Center, serving as chief resident and receiving the Morris Leider Award for excellence in dermatology.

Dr. Gruson is a fellow of the American Academy of Dermatology and an active member of numerous professional medical organizations, including the New York State Medical Society, the American Contact Dermatitis Society, and the Dermatologic Society of Greater New York. She has conducted research and published numerous scholarly articles on dermatology topics, including skin allergies, her area of expertise, and she has presented these findings at national medical conferences.

As a clinical assistant professor at the NYU School of Medicine, Dr. Gruson teaches dermatology residents and also advises medical students who are considering the dermatology specialty.

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Sherry H. Hsiung, MD, is a board-certified dermatologic surgeon at the Skin Institute of New York (SINY®). Dr. Hsiung also practices general and cosmetic dermatology at SINY’s® three New York City–area offices, in the city’s West Village and in the Bay Ridge and Park Slope areas of Brooklyn, New York.

At the Massachusetts Institute of Technology in Cambridge, Massachusetts, Dr. Hsiung earned undergraduate degrees in both biology and chemical engineering, graduating with honors. While earning her medical degree from the University of Pennsylvania Medical School in Philadelphia, she was a member of the prestigious Alpha Omega Alpha Honor Medical Society. She then completed her residency in dermatology at New York University School of Medicine in New York City, serving as chief resident.

Dr. Hsiung retains active memberships in the American Academy of Dermatology and the American Society of Dermatologic Surgery, and she has lectured on dermatology topics at local and national conferences. She serves as a medical editor for the Journal of Drugs in Dermatology and is a consultant for the Kiehl’s Dermatology Advisory Board.

As a crucial part of the SINY® medical team, Dr. Hsiung specializes in Mohs Micrographic Surgery, a surgical technique used to treat skin cancer, focused on removing all of the cancer cells while preserving the healthy tissue in sensitive areas such as the face, hands, feet or genitals. She completed a prestigious fellowship in Mohs surgery with Dr. Perry Robins at NYU, and she is an active member of the American College of Mohs Surgery. Dr. Hsiung’s surgical expertise ranges from the simplest excisions to the most extensive skin cancer surgeries and repairs.