Our Team

Meet our board-certified, clinically and academically accomplished Physicians, expert Physicians Assistants (PA-C’s), skilled Nurse Practitioners (NP’s), Registered Nurses (RN’s) and dedicated staff, who make up the team at our Midtown Manhattan medical practice.

George P. Liakeas, M.D. Medical Director

George Liakeas, MD is a native New Yorker, who is one of the best primary care physicians in Manhattan. He received his medical degree from Albert Einstein College of Medicine and completed his Residency in Family Medicine at Beth Israel Medical Center, Institute for Urban Health. He is certified by the American Board of Family Medicine and has been in general practice in Manhattan for over 16 years. 

Currently, Dr. George serves as both the medical director of Lexington Medical Associates and Smooth Synergy Cosmedical Spa, as well as a top medical concierge doctor  with Castle Connolly Private Health Partners. He has affiliation with Mount Sinai Beth Israel Hospital and full privileges at Lenox Hill Hospital. His caring attitude, superb bedside manner, compassionate care and clinical acumen have earned him respect among his colleagues and patients, earning him a name amongst America’s Top Doctors® multiple times. He has received over two dozen awards and recognitions: of note are distinctions from the American Academy of Family Physicians and the American Medical Association.

Dr. George enjoys sharing his passion for medicine, including in his past role as the President of the Hellenic Medical Society of New York, as well as serving as a Teaching Physician for the Icahn School of Medicine at Mount Sinai, New York Medical College, Keck School of Medicine at the University of Southern California and Mercy College of Physician Assistants. He has also been the New York City Marathon Medical Captain since 2001. 

He resides near Lexington Medical’s office in Midtown East Manhattan with his wife and two daughters. In his free time, he is a movie buff and an avid sports enthusiast.


Umama Sadia, M.D.

Umama is originally from Pakistan. She received her medical degree from the Aga Khan Medical University in Karachi. Her residency was in Family Medicine at the University of Nebraska, which was followed by a fellowship at the University of West Virginia. Previously, she worked at a Federally Qualified
Health Care Center in Louisville Kentucky, where she also served as gratis faculty at the University of Lexington.

Umama loves the strong work ethic of her colleagues at Lex Med, who work together as a team to provide the best medical care for patients. Working in primary care means she’s often a patient’s first medical contact. As such, she’s incredibly honored that patients put their trust in her, and relishes
the opportunity to see people from all age groups and backgrounds.

In her free time, Umama loves spending time with her family, which includes two children. Together, they enjoy watching movies and going for walks in the park. She also loves to read and, of course, shopping.

Her favorite quote is “Yesterday I was clever, so I wanted to change the world. Today I am wise, so I am changing myself.” – Rumi

Coleen Calamari BSN, RN

Coleen is originally from New Jersey. At the age of thirteen, she knew that she wanted to become a nurse. She earned a Bachelor of Science in Nursing from The Catholic University of America in Washington, DC. After graduating, she completed a year of volunteer service, providing nursing care for people experiencing homelessness at a health center in Denver, Colorado. This experience confirmed her passion for providing nursing care and getting to know patients in a primary care / outpatient setting. She then returned to New York City and joined the Lexington Medical team in pursuit of this goal. 

Coleen’s favorite things about Lexington Medical are the teamwork between her colleagues and the relationships they form with patients throughout the continuum of care. 

She also enjoys spending time with her family, baking, and seeing Broadway shows. One of her favorite quotes is “The pessimist sees difficulty in every opportunity. The optimist sees opportunity in every difficulty.” -Winston Churchill 

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