Find a Top Internist Near Me in Hempstead, NY – Book an Appointment Instantly

Dr. Rafael A. Guillén is an internist in the Bronx, in New York City. As the physician at R. Guillén MD PC, Dr. Guillén offers a wide range of care including allergy care, help with obesity, hepatitis care, diabetes care, cholesterol management, high blood pressure treatment, asthma treatment, and arthritis treatment. R. Guillen MD PC is a Patient-Centered Medical Home, recognized by the National Committee for Quality Assurance for providing coordinated, advanced primary care, ensuring that patients are put in the forefront of their care, and a commitment made for continuous quality improvement. Dr. Guillén offers comprehensive health care for adults in the Bronx area. He’s bilingual in English and Spanish and has also carefully chosen a multi-lingual staff for the convenience of his patients.

Dr. Guillén attended the University Eugenio Maria de Hostos School of Medicine in the Dominican Republic. He completed his residency in Internal Medicine at the Bronx-Lebanon Hospital Center in the Bronx, New York. Dr. Guillén is a Diplomate of the American Board of Internal Medicine, and a Fellow of the American College of Physicians. He is an active member of numerous medical organizations, including the American Medical Association, the American College of Physicians, and the Dominican College of Physicians.

Dr. Guillén and his team look forward to seeing new patients and established patients alike. Contact the office anytime to arrange an appointment.

Jeffrey Crespin, MD

Jeffrey Crespin, MD, has been a practicing gastroenterologist in Manhattan for more than 20 years and has convenient office locations across New York City in the Upper East Side, Midtown East, and Midtown West. As a board-certified gastroenterologist, Dr. Crespin strives to provide the highest quality medical care in a compassionate, professional, and personalized manner.

Dr. Crespin graduated cum laude from Harvard University with a bachelor’s degree in biology. After spending a year studying cinema, psychology, and literature at the Sorbonne in France, Dr. Crespin attended Washington University School of Medicine in St. Louis, Missouri, where he graduated with his medical degree. He then completed his internship and residency training through the University of Minnesota before rounding out his training with a fellowship in gastroenterology at Northwestern Memorial Hospital in Chicago, Illinois. In addition to his medical education and training, Dr. Crespin has a Master of Business Administration from the New York University (NYU) Stern School of Business.

Before opening up his private practice, Dr. Crespin served as the director of the Columbia-St. Luke's Roosevelt GI clinic. He is expertly trained in endoscopic procedures, which allows for direct visualization of the intestinal tract for optimal diagnosis, treatment, and prevention of gastrointestinal diseases such as irritable bowel syndrome, Crohn’s disease, and colitis. To ensure his patients have access to the best care possible, Dr. Crespin conveniently offers same-day, late-hour, and weekend appointments.

Recognized as one of New York’s “Top Doctors,” Dr. Crespin is affiliated with NYU Lenox Hill Hospital, St. Luke's Roosevelt, and the Beth Israel hospitals. He is also a clinical assistant professor of medicine at NYU.

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Peggy Elango, DO, is a primary care physician serving patients in the New York City area. At her practice in the Lenox Hill area of Manhattan, she provides a wide range of internal and concierge medicine services.

Dr. Elango attended Michigan State University, where she received her medical degree. She is board certified by the American Osteopathic Board of Internal Medicine and is a member of the American Osteopathic Association. She speaks English and French, which makes her accessible to patients from a variety of cultural backgrounds.

Dr. Elango is originally from Cameroon and grew up in Atlanta, Georgia. She comes from a family of physicians. Dr. Elango believes in listening to each patient and creating a partnership to maintain and improve lifelong health. Patients trust her expertise because she consistently provides high-quality care that leads to positive and lasting health outcomes.

Dr. Elango is affiliated with Lenox Hill Hospital and NYU Langone Health.

Dr. Michelle Henry is an international speaker, trainer, and author. As a board-certified dermatologist and dermatologic surgeon, she has established herself as a prominent figure in the industry. Dr. Henry serves as the CEO and founder of Skin & Aesthetic Surgery of Manhattan, as well as the founder of The Henry Research Group. In addition to her private practice, she holds the position of Clinical Instructor of Dermatology at Weill Cornell Medical College.

Dr. Henry specializes in general dermatology, Mohs micrographic, and cosmetic surgery. She completed her residency in dermatology at Mount Sinai Hospital in New York City, where she served as Chief Resident. Following her residency, Dr. Henry pursued further specialization through a fellowship in cutaneous oncology, Mohs micrographic, and reconstructive surgery at Harvard Medical School. Driven by her passion for providing exemplary care, she focuses on high-risk skin cancer treatments, cosmetic surgery, hair loss solutions, skin rejuvenation techniques, and addressing the unique needs of diverse skin types.

Recognized for her talent and dedication, Dr. Henry has been featured in renowned publications such as Forbes, The New York Times, Harper's Bazaar, The Cut, Byrdie, and Coveteur. These features highlight her artistic prowess in the field of dermatology as well as her advocacy efforts. Furthermore, she has contributed significantly to the medical community through her extensive publications, authoring numerous articles and book chapters. She enjoys medical media and has globalized her teaching efforts as an on-air contributor for the Today show.

Dr. Henry's reputation is solidified by her inclusion in prestigious accolades such as Castle Connolly Top Doctor and New York Magazine Top Doctor. Additionally, she actively serves on multiple medical boards, conducts FDA clinical trials, and is a member of the product validation board at L'Oréal. She is a distinguished fellow of the American Academy of Dermatology, American Society of Dermatologic Surgery, and American College of Mohs Surgery. She also serves on the Board of Directors for the Melanoma Research Foundation and has been awarded their prestigious Excellence in Prevention award.

At the core of Dr. Henry's treatment philosophy lies a commitment to holistic care that integrates the latest advancements in technology and scientific research. She strives to provide her patients with the most effective and cutting-edge solutions, ensuring optimal outcomes and patient satisfaction.

Dr. William Martin is a top-rated internist and primary care physician serving patients from Midtown Manhattan and throughout the Greater New York City metro region. As a skilled and compassionate physician, Dr. Martin is skilled in the diagnosis and treatment of a wide array of conditions, including sinusitis, bronchitis, asthma, diabetes, urinary tract infections, high cholesterol and high blood pressure, chronic fatigue, migraines, eczema, psoriasis, colds and other respiratory infections, back pain, anxiety and depression, and thyroid disorders.

Dr. Martin received his medical degree from the University of Vermont after receiving a bachelor's degree in chemistry from the same institution, and completed his residency in internal medicine at St. Lukes-Roosevelt Hospital in New York City. As a leading physician dedicated to the needs of his patients, Dr. Martin maintains active memberships in several medical associations and is a diplomate of the American Board of Internal Medicine.

Dr. Martin is a strong proponent of patient-centered care and patient education, ensuring each patient he treats receives the most appropriate care and treatment based on an in-depth evaluation of the patient's unique needs, medical history and current health status. During office visits, every patient receives the information they need to understand the medical issues they face, including existing and emerging disease risk factors, and the treatment options that are available to them so they can make confident and informed decisions about their care.

Dr. Martin enjoys meeting new patients at his practice on East 54^th Street, and the practice accepts most major forms of medical insurance plans.

Kornelia Teslic, MD  is a Board Certified Diagnostic NeuroRadiologist at Citimed Comprehensive TBI Center. She completed her fellowships at Weill Cornell, NY, and Memorial Sloan- Kettering Cancer Center, NY. She has 20 years of experience in neuroimaging including advanced MRI techniques. She speaks English, Spanish, Croatian, and Serbian.

As a highly-trained diagnostic radiologist, Dr. Teslic specializes in neuroradiology. She provides a complete range of diagnostic imaging services, including advanced diffusion-weighted MRIs for cancer detection and diffusion tensor MRIs for brain imaging.   

Robert Waxman, MD Board Certified Radiologist. He completed his fellowship at Body Imaging & Musculoskeletal, Thomas Jefferson University Hospital, Philadelphia, PA. Dr. Waxman is extremely knowledgable in any musculoskeletal imaging. 

Damon Spitz, MD Board Certified Radiologist in Musculoskeletal Radiology. Dr. Spitz completed his fellowship at New England Baptist Hospital Beth Israel Deaconess Medical Center.  Dr. Spitz plays a key role in expanding the radiology and interventional pain services and building a strong foundation for musculosketal reads.

Dr. Michael Aziz is a board-certified Internal Medicine physician, author, and a broadcast media commentator. He is as an attending physician at Lenox Hill Hospital in New York City. Dr. Aziz completed his medical training at Long Island Jewish Medical Center and Staten Island University Hospital in New York. He is a member of the American College of Physicians,  the American Society of Internal Medicine, and a fellow of the Royal Society of Medicine in the United Kingdom. Dr. Aziz is also a keynote speaker at numerous national and international conferences, including those organized by the American Academy of Anti-Aging Medicine.

As the founder of the practice that integrates traditional and functional medicine, Dr. Aziz focuses on addressing  the root cause of disease. He is the author of "The Perfect 10 Diet," a book that challenged outdated dietary guidelines, and advocated a balanced, natural diet long before the new USDA food Pyramid was introduced in 2026.

Dr. Michael Aziz was among the first doctors to alert the public about  the danger of seed oils, and transfats long before the media caught on.  Dr. Aziz was also the first doctor to alert the public about the dangers of both low-carb and keto diets since nitrites in processed meats have been linked to many types of cancer.  

Upon release, Dr. Michael Aziz was featured on ABC's billboard in Times Square in NYC. He also made it on the cover of "First for Women," one of the largest magazines in the United States. The Perfect 10 Diet became an instant bestseller. The Perfect 10 Diet hit the number one spot on Amazon for 12 consecutive weeks in 2011. The Perfect 10 Diet was also picked up for translation into several foreign languages including; Italian, Chinese, Mandarin, Slovenian, Urdu, Malay, and Indonesian. Dr. Aziz and The Perfect 10 Diet were featured on countless TV shows including "The View," "The Doctors," "Fox and Friends," and "Dr. Oz." He has been a guest on hundreds of radio shows, podcasts, The Mel Robbins show, and NPR.   

In 2025, Dr. Aziz released his second book, "The Ageless Revolution." It is the first book on the market that addresses aging as a disease. It is a new concept in medicine since it targets cellular malfunction. Alarmed by the high mortality rates in the US during the COVID-19 pandemic, Dr. Aziz emphasizes the need for proactive health measures to improve healthspan, and prolong the lifespan. His approach integrates traditional and functional medicine aiming to treat aging rather than treating chronic age-related diseases using supplements, hormone replacement, and peptides. 

The book was also an immediate bestseller, topping at 300 on Amazon and hitting the number 1 spot in the anti-aging, longevity, menopause, and holistic medicine categories for several weeks. The book was also picked up  to be translated into several foreign languages including Portuguese, Polish, and Chinese. 

Dr Aziz is a prolific contributor to Life Extension Magazine with the "Ask the Doctor"column which reaches 400,000 readers monthly. He had been a contributor to The Boardroom Newsletters which reached over 7 million subscribers with health advice in 2010's. He is a also a medical contributor to Biohackyourself (website and magazine) that reaches over 3 million people on social  media. Dr. Aziz's columns, articles, and opinions have been published in The LA Times, CNN.com, Fox.com, The Washington Post, WebMD, The NY Post, the Daily News, Katie Couric Media, Harper's Bazaar, Forbes, as well as in hundreds of publications internationally around the world such as The Daily Mail, Paris Match, The Saigon Times, and El Arabyia.  

Dr. Aziz regularly provides medical commentary on many health networks, including NBC, NPR, Fox, Fox 5 NY, ABC, WGN Chicago,  Telemundo, the Will Cain show, and Dubai TV. Dr. Aziz is passionate about philanthropy. He volunteered to help New Yorkers during the Covid-19 pandemic, and treated underserved communities in remote villages of Indonesia. He is also donating the proceeds of The Ageless Revolution for charity to help women affected by breast cancer. 

Medical Compass MD, led by David Dunaief, MD, is an integrative, functional, and lifestyle medicine practice with offices in Brooklyn Heights, Brooklyn, in New York City and in Setauket, New York, on Long Island.

Dr. Dunaief takes a plant-based approach to wellness as derived through nutritional medicine and lifestyle interventions that reverse, prevent and treat chronic disease. He takes an individualized approach to care, using cutting-edge medical research to guide his decision making.  

Medical Compass MD specializes in chronic care management, providing integrative medicine treatments for conditions like autoimmune disorders, diabetes, migraines, and heart disease. 

With a focus on preventive medicine, Dr. Dunaief’s integrative approach uses the low inflammatory foods every day (LIFE) diet — a plant-based, nutrient-dense, whole-foods approach to health and wellness.

Dedicated to improving health care for all, the practice produces cutting-edge research on the LIFE diet that has been published in peer-reviewed medical journals.

At Medical Compass MD, the focus is on reversing, treating, and preventing chronic disease by connecting conventional medicine with lifestyle modifications. This approach gives patients the ability to take a more proactive role in managing their own health.

For evidence-based medical care for optimal health, call Medical Compass MD or request an appointment online today.

Ahmadur Rahman is a detailed and thorough physician specializing in internal medicine and primary care. Dr. Rahman is serving his patients in Manahattan, NY and Jamaica, NY with his two private practices. He is certified by the American Board of Internal Medicine. 

Dr. Rahman received his doctorate degree from the Ross University School of Medicine. He then completed his Internal Medicine residency at the Newark Beth Israel Medical Center. Dr. Rahman welcomes patients to his practice who are experiencing issues such as acne, bunions, arthritis, asthma, ear infections, and diabetes. With his informative bedside manner, Dr. Rahman works to a solution for improved health and healing. Dr. Rahman provides services for his patients that include annual physicals, ECG/EKG, bone density measurements, and annual skin screenings, among many others. 

Dr. Rahman enjoys participating in outdoor activities, when time permits. He enjoys spending time with his family, photography, and traveling.

Natalie Marks, MD, is a board-certified vascular surgeon who serves the community of Borough Park in Brooklyn, New York, at the Vascular Institute of New York. With more than 25 years of experience, Dr. Marks is passionate about using the latest advancements in medical technology to diagnose and treat a wide range of vascular conditions, including hypertension, peripheral arterial disease (PAD), venous leg ulcers, and diabetic vascular disease.

Growing up in Ukraine, Dr. Marks earned her Medical Doctorate from Crimea State Medical University in Simferopol, Ukraine. She later moved to the United States to complete her internal medicine residency at Maimonides Medical Center in Brooklyn. 

Dr. Marks is certified by both the American Board of Vascular Medicine and Internal Medicine. She also holds certifications from the National Alliance of Wound Care and Ostomy and in Diagnostic Medical Sonography (RDMS) for vascular technology.

In addition to her time at the Vascular Institute of New York, Dr. Marks is an attending physician at Brooklyn’s Maimonides Medical Center, New York Community Hospital, and NYU Langone Brooklyn Medical Center. She also belongs to a number of professional organizations, including the American College of Physicians and the American Society for Vascular Medicine.

Click here to read Dr. Natalie Marks' online profile.

Elizabeth Sharp Edens, M.D., DABOM, IFMCP is a board-certified Internal Medicine and Obesity Medicine Physician, Institute for Functional Medicine Certified Practitioner and the founder of Health Meets Wellness. Dr. Sharp started Health Meets Wellness to make functional medicine more accessible, combining her expertise in healthcare with physical activity, specifically yoga. Dr. Sharp completed her 200-hour yoga teacher training and believes in combining daily movement practices with medicine to help treat her patients. She is dedicated to helping her patients reach their wellness goals and developed the Health Meet Wellness method with Troy Flanagan, Ph.D. and Susie Parker-Simmons, RDN, specifically to help patients with weight management. 

In addition to her innovative practice, she is an Assistant Professor at Mount Sinai Hospital. She graduated medical school Magna Cum Laude from St. George’s University and completed her residency in Manhattan at Lenox Hill Hospital. After residency, she worked for Mount Sinai Doctors where she was awarded the Cullman Family Award for Excellence in Physician Communication and worked at OneMedical. Through her education and real-life experience, Sharp uncovered that taking a functional medicine approach helps diagnose and treat the root cause of her patient’s symptoms and disease processes. Her patient-centered style of practice combines diet and lifestyle with medicine to deliver multifaceted, holistic care for her patients. When she's not seeing patients she enjoys cooking, hiking, rock climbing , running, yoga and spending time with her friends and family.

Jeffrey Crespin, MD

Jeffrey Crespin, MD, has been a practicing gastroenterologist in Manhattan for more than 20 years and has convenient office locations across New York City in the Upper East Side, Midtown East, and Midtown West. As a board-certified gastroenterologist, Dr. Crespin strives to provide the highest quality medical care in a compassionate, professional, and personalized manner.

Dr. Crespin graduated cum laude from Harvard University with a bachelor’s degree in biology. After spending a year studying cinema, psychology, and literature at the Sorbonne in France, Dr. Crespin attended Washington University School of Medicine in St. Louis, Missouri, where he graduated with his medical degree. He then completed his internship and residency training through the University of Minnesota before rounding out his training with a fellowship in gastroenterology at Northwestern Memorial Hospital in Chicago, Illinois. In addition to his medical education and training, Dr. Crespin has a Master of Business Administration from the New York University (NYU) Stern School of Business.

Before opening up his private practice, Dr. Crespin served as the director of the Columbia-St. Luke's Roosevelt GI clinic. He is expertly trained in endoscopic procedures, which allows for direct visualization of the intestinal tract for optimal diagnosis, treatment, and prevention of gastrointestinal diseases such as irritable bowel syndrome, Crohn’s disease, and colitis. To ensure his patients have access to the best care possible, Dr. Crespin conveniently offers same-day, late-hour, and weekend appointments.

Recognized as one of New York’s “Top Doctors,” Dr. Crespin is affiliated with NYU Lenox Hill Hospital, St. Luke's Roosevelt, and the Beth Israel hospitals. He is also a clinical assistant professor of medicine at NYU.

Michael Liou, MD, FACC, FSCAI, is a skilled, board certified interventional cardiologist practicing at Chinatown Cardiology P.C., which has locations in Flushing, Brooklyn, Chinatown, and the Upper West Side of Manhattan. 

Dr. Liou earned his medical degree from SUNY Stony Brook School of Medicine after completing the prestigious Sophie Davis Biomedical Education Program at CUNY City College. He completed his internship and residency in internal medicine at NYU Langone Medical Center and performed his fellowship training in cardiovascular disease at Beth Israel Medical Center (now known as Mount Sinai Beth Israel) and returned to NYU Langone Medical Center for his advanced interventional cardiology subspecialty fellowship. 

Although he provides care for all cardiovascular conditions, Dr. Liou’s clinical expertise is in performing transradial cardiac catheterization, peripheral endovascular intervention, percutaneous mitral & aortic valvuloplasty, and ASD/PFO closure. He continues to participate in clinical research with a special focus on cardiovascular diseases affecting Asian Americans. 

Dr. Liou is multi-board certified in cardiovascular diseases, echocardiography, nuclear cardiology, and interventional cardiology.