Cardiologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Chiropractor providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Dentist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Dermatologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Family Physician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
OB-GYN providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Ophthalmologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Orthopedic Surgeon providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Pediatrician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Physical Therapist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Podiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Psychiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Dr. Marie Amanze is a Hematologist/Oncologist serving FSCDR patients in the Jacksonville and Florida Panhandle regions. She specializes in the diagnosis, treatment, and long-term management of blood disorders, including sickle cell disease, and is dedicated to improving patient outcomes through comprehensive and compassionate care.
Gershwin Blyden, MD, PhD, FCP, FACP, is a board-certified hematologist-oncologist and medical director of The Foundation for Sickle Cell Disease Research, with locations in Homestead, Orlando, Lakeland, Jacksonville, Belle Glade, Tallahassee, and Hollywood, Florida. With more than 40 years of diverse experience, Dr. Blyden is an esteemed physician in his field.
After receiving his bachelor’s degree in plant science from the Tuskegee Institute (now Tuskegee University) in Tuskegee, Alabama, in 1967, Dr. Blyden earned a PhD in pharmacology from prestigious Yale University in New Haven, Connecticut, in 1976. Just three years later, he also earned his medical doctorate cum laude from Yale University.
In 1985, Dr. Blyden completed an internal medicine internship at Massachusetts General Hospital in Boston, Massachusetts. That same year, he also finished his hematology/oncology and clinical pharmacology fellowship at Tufts Medical Center in Boston, Massachusetts.
After graduating and completing his training, Dr. Blyden worked as an adjunct professor for the Barry University School of Podiatric Medicine in Miami Shores, Florida, an associate clinical professor of hematology and oncology at the University of Miami School of Medicine in Miami, Florida, and as an associate professor of clinical pharmacy and director of the Clinical Pharmacology Research Unit at Florida A&M University’s Miami location.
Today, Dr. Blyden is a leader in the field of sickle cell treatment, case management, and research. He provides comprehensive care for chronic diseases, with a special emphasis on sickle cell anemia.
Dr. Blyden offers a variety of infusion services, school individualized education program (IEP) support, transcranial Doppler ultrasounds, and more.
Dr. Costner McKenzie is a board-certified dermatologist at the Skin Institute of New York (SINY®), providing comprehensive dermatologic care to adult and pediatric patients in Manhattan. With expertise in both medical and cosmetic dermatology, Dr. McKenzie combines academic excellence, research leadership, and compassionate patient care to deliver individualized, evidence-based treatment plans.
Dr. McKenzie’s academic and clinical training reflect a deep commitment to excellence:
Bachelor’s Degree in Human Biology – Stanford University
Doctor of Medicine (MD) – Northwestern University Feinberg School of Medicine
Inducted into the prestigious Alpha Omega Alpha Honor Medical Society
Dermatology Residency (Chief Resident) – New York University
At Northwestern, Dr. McKenzie’s academic performance and dedication to medicine earned him membership in Alpha Omega Alpha, recognizing exceptional academic achievement and professionalism. During residency at NYU, he refined his diagnostic, surgical, and cosmetic skills under nationally recognized leaders in dermatology and served as Chief Resident in his final year.
Clinical Expertise & Special Interests
Dr. McKenzie provides comprehensive dermatologic care with special focus on:
Eczema and inflammatory skin disorders
Acne and acne scarring
Hair loss and scalp conditions
Skin cancer screening and prevention
Cosmetic dermatology and injectables
Pediatric dermatology
His clinical and research interests also include health disparities in dermatology, reflecting his commitment to equitable and inclusive skin care for patients of all backgrounds
Dr. McKenzie is known for combining scientific rigor with a highly personalized approach, ensuring each patient feels heard, supported, and confident in their treatment plan.
Research, Publications & Academic Leadership
Dr. McKenzie is a well-published author with research featured in respected dermatology journals. He has presented his work at national and international meetings, contributing to advancements in the understanding and treatment of eczema, acne, hair loss, and dermatologic health disparities
He remains actively involved in medical education and is committed to mentoring and training future dermatologists.
Active Member, American Academy of Dermatology
Contributor to peer-reviewed dermatology literature
National and international presenter
Patient Experience & Satisfaction
Patients consistently describe Dr. McKenzie as personable, knowledgeable, and exceptionally attentive. Many highlight his outstanding bedside manner, noting that they never feel rushed and always feel fully heard. He is frequently praised for clearly explaining diagnoses and treatment options, providing structured care plans, and ensuring patients leave feeling confident and informed.
Patients also commend the professionalism and friendliness of the SINY team, efficient scheduling, and welcoming office environment
Patient Experience & Satisfaction
Patients consistently describe Dr. McKenzie as personable, knowledgeable, and exceptionally attentive. Many highlight his outstanding bedside manner, noting that they never feel rushed and always feel fully heard. He is frequently praised for clearly explaining diagnoses and treatment options, providing structured care plans, and ensuring patients leave feeling confident and informed.
Patients also commend the professionalism and friendliness of the SINY team, efficient scheduling, and welcoming office environment.
Convenient Locations in New York
Dr. McKenzie sees patients at two SINY Dermatology locations in Manhattan, offering convenient access to expert dermatologic care.
Upper East Side
69 E 76th St, New York, NY 10021 Phone: 800-778-3090
Hours:
Mon: 9:00 AM – 5:00 PM
Tue-Thu: 9:00 AM – 8:00 PM
ri: 8:00 AM – 4:00 PM
Sat-Sun: Closed
Serving patients from: Upper East Side, Lenox Hill, Carnegie Hill, Yorkville, Midtown East, Roosevelt Island, Upper West Side, East Harlem, and surrounding Manhattan communities.
1000 Park Ave, New York, NY 10028 Phone:800-778-3090
Hours:
on-Tue: 9:00 AM – 5:00 PM
Wed: 12:00 PM – 8:00 PM
Thu: 9:00 AM – 5:00 PM
Fri: Closed
Sat: 10:00 AM – 3:00 PM
Sun: Closed
Serving patients from: Upper East Side, Carnegie Hill, Lenox Hill, Yorkville, Midtown East, Central Park East, and surrounding Manhattan neighborhoods.
Dr. McKenzie 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
Fidelis Care (NY)
Humana
Oscar Health
MetroPlus Health Plan
MagnaCare
1199SEIU
Additional plans accepted. Patients are encouraged to contact SINY Dermatology to confirm coverage prior to their 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.
Thomas Nguyen, MD, MS, is a skilled internal medicine and nephrology physician at Nguyen Medical Group in Boynton Beach, Florida. Dr. Nguyen considers it a privilege to serve the community where he grew up.
Dr. Nguyen started his educational pursuits at the University of Florida in Gainesville, where he completed his Bachelor of Science in microbiology in 2000. After completing his undergraduate studies, Dr. Nguyen earned his Master of Science in molecular genetics and gene therapy in 2002, also from the University of Florida. In 2006, he earned his Doctor of Medicine from Drexel University in Philadelphia, Pennsylvania.
After completing his studies, Dr. Nguyen returned to his home state of Florida, where he completed his residency and fellowship at UF Health Jacksonville (formerly Shands Jacksonville) in 2011. Shortly after, Dr. Nguyen opened Nguyen Medical Group.
As an experienced physician, Dr. Nguyen understands the importance of strong doctor-patient relationships. At well-visits, he takes great pleasure in learning about the lives of his patients while simultaneously assessing their health. Dr. Nguyen takes great pride in being there for his patients, especially when their health is compromised, so he can be their guiding light, steering them back into good health.
To schedule an appointment with Dr. Nguyen and the team at Nguyen Medical Group, call the office or book online today.
Medical Doctor since 1985. Specialist in Internal Medicine, Gastroenterology and Hepatology. Fellow of The American College of Physician, Fellow of The American Association for the Study of Liver Diseases. Member of the American Association of Gastroenterology, The American Obesity Association and the ALEH. Unrestricted active Medical License in Florida and Puerto Rico (USA). Fifteen years teaching experience in the Gastroenterology Residency Program at Red Cross Hospital "Carlos J. Bello" Former President of the Hepatology Chapter of the Venezuelan Society of Gastroenterology. Published several papers and held presentation in the field of Gastroenterology and Hepatology. Since 2015 Practicing as a Internal Medicine/Liver Diseases Physician in Palm Beach County, Florida, USA. Medical Director at Bright Future Mental Health , Lake Worth, FL. Civil Surgeon Designation by USCIS
Y. Joseph Usta, MD, was born in Iowa City, Iowa. He was raised on an American compound in Dhahran called Aramco and went to high school at a Department of Defense Navy base in Bahrain. He completed his undergraduate degree at the University of Arizona in Molecular and Cellular Biology and Chemistry. He did a year of GI research n pancreatic cell transplant at Emory University in Atlanta. He completed his medical school at the American University of Beirut (AUB). He did his Internal Medicine training at St. Joseph Hospital and Fellowship in Gastroenterology and Hepatology at the University of Arizona in Phoenix, Arizona. During his training he was selected as a fourth year Chief Resident in Internal Medicine and again selected to be Chief Fellow in Gastroenterology.
He also served as an Assistant Professor for both the University of Arizona and Creighton Medical Schools. Currently, Dr. Usta gives monthly lectures to residents and students at Wellington Reginal Medical Center and regularly has residents seeing patients with him in his clinic.
Dr. Usta is trained in all general GI but has a specific interest in liver diseases (Hepatology). He is very comfortable taking care of complex liver diseases including fatty liver, hepatitis B and C, cirrhosis, and getting patients ready for liver transplants consideration.
Dr Usta sees patients upstairs in the clinic and does procedures downstairs at the endoscopy center in the same building, cutting commute time and confusion for his patients. Some of the procedures he does include Upper Endoscopy (EGD), Screening Colonoscopy, and Capsules. He sees patients with Gastroesophageal Reflux (GERD), swallowing difficulties, and Barrett’s Esophagus. He regularly removes colon polyps during screening colonoscopies to help prevent colon cancer.
He also treats hemorrhoids using the CRH O'Regan System banding which is “fast and painless, over 99% effective and covered by insurance with no recovery time, fasting, or sedation” as per their website.
Professional & Teaching Experiences
Assistant Professor, University of Arizona.
Assistant Professor, Creighton Medical School.
Research & Publications
Poster 1675 Agent Orange Exposure
Presented an abstract to the 2015 American College of Gastroenterology's (ACG)
Hobbies
Dr. Usta has two daughters and a son, and a pet tortoise named “Tiki”. His hobbies include working out at Orang Theory, fishing, kayaking, biking, and any activity that includes the pool or beach. He is also not scared to try new foods from around the world. He loves gardening and has a few fruit trees that he manages in his backyard. He is currently taking online courses at Standford University on quantum physics for fun and loves to read books about history especially pertaining to World War I and II.
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