Dr. Gregory Mark McWilliamsM.D.
Internal Medicine
at Weill Cornell Medicine Primary Care — New York, NY
About
D. S. in Biology cum laude from Harvard University, where he also studied Spanish. He earned his medical degree from Georgetown University School of Medicine. His residency training in Internal Medicine, with a focus in Primary Care, took place at New York-Presbyterian Weill Cornell Medical Center. Dr. McWilliams holds board certification in Internal Medicine and practices today at Weill Cornell Medicine Primary Care on Manhattan's Upper East Side.
Dr. McWilliams has a particular clinical interest in LGBT medicine. He brings a relationship-oriented approach to adult primary care and takes time to coordinate care with specialists when patients need it. Outside the office, he lives in New York City with his partner Scott and their rescue dog Mango. He enjoys traveling, skiing, and playing the piano.
Education & Training
Undergraduate
Harvard University, B.S. Biology (cum laude), minor in Spanish
Medical School
Georgetown University School of Medicine
Residency
Internal Medicine with a focus in Primary Care, New York-Presbyterian Weill Cornell Medical Center
Certifications
Who is Dr. McWilliams right for?
Dr. McWilliams is a strong fit for adults seeking a thorough, relationship-driven primary care doctor in Manhattan. Patients who value direct access to their physician will appreciate his private cell phone availability for urgent concerns. He is particularly well-suited for LGBT patients seeking affirming, knowledgeable primary care. His specialist coordination skills benefit patients managing complex or ongoing health needs.
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Frequently Asked Questions
Dr. McWilliams specializes in internal medicine and primary care for adults. He has a particular clinical interest in LGBT medicine. His training at New York-Presbyterian Weill Cornell Medical Center prepared him to manage a wide range of adult health concerns, from preventive care to chronic disease management.
Yes, Dr. McWilliams holds board certification in Internal Medicine. He completed his residency at New York-Presbyterian Weill Cornell Medical Center with a focus in Primary Care.
Dr. McWilliams earned his undergraduate degree cum laude in Biology from Harvard University. He then earned his medical degree from Georgetown University School of Medicine. He completed his Internal Medicine residency at New York-Presbyterian Weill Cornell Medical Center.
Yes, LGBT medicine is one of Dr. McWilliams's primary clinical interests. He brings focused knowledge and an affirming approach to caring for LGBT patients across all aspects of primary care.
Yes. Dr. McWilliams provides members with his private cell phone number for urgent after-hours communication. This direct access is one of the key benefits of membership in the Concierge Choice Program.
Dr. McWilliams focuses on adult primary care. His patients include people seeking preventive wellness, those managing chronic conditions, and individuals looking for an internist with experience in LGBT medicine. He serves patients at his Upper East Side Manhattan office.
Yes, Dr. McWilliams provides personalized advocacy and coordination with specialists when patients need it. He also stays connected with hospital physicians if a patient requires an inpatient stay.
Doctor profile last updated April 11, 2026