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Alexander J Greenstein, MD Email Alexander Greenstein

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Mount Sinai Doctors ?
    • Positions
    • ASSISTANT PROFESSOR | Population Health Science and Policy
    • Specialty
    • Surgery
    • Languages
    • English
    • French
    • Spanish
    • Hospital Affiliations
    • Mount Sinai Queens
    • New York Eye and Ear Infirmary of Mount Sinai
    • The Mount Sinai Hospital
    • Mount Sinai Brooklyn
    • Mount Sinai Beth Israel
    • Mount Sinai Morningside and Mount Sinai West

Dr. Alexander J. Greenstein is the Surgical Co-Director of the IBD Center at Mount Sinai and an Associate Professor of Surgery and Health Policy. He specializes in minimally invasive (laparoscopic, single incision, robotic) surgery for Crohn's Disease, Ulcerative Colitis, Diverticulitis and other gastrointestinal (colon, small intestine, gallbladder, stomach) tract disorders. Prior to joining as faculty, Dr. Greenstein completed a surgical residency at The Mount Sinai Hospital and a fellowship in minimally invasive surgery at the Oregon Health and Sciences University in Portland, Oregon. In addition, Dr. Greenstein completed a residency in general preventative medicine and attained a Masters in Public Health at the Mount Sinai School of Medicine. Dr. Greenstein graduated from Cornell Medical College in New York with Alpha Omega Alpha distinction after completing his bachelor’s degree in economics cum laude with distinction at Yale University.

Dr. Greenstein is certified by the American Board of Surgery and is a Fellow of the American College of Surgeons (FACS). He has been a first or co-author of more than 60 peer-reviewed manuscripts, has editorial responsibilities at several journals, and has presented his work at both regional and national surgical meetings. He is a recipient of the David A. Dreiling Award for Scholarly Excellence from the Mount Sinai Department of Surgery.

Dr. Greenstein is an active member of multiple surgical societies (ACS, SSAT, SAGES). Research engagements include experiences at the National Institute of Mental Health, the Memorial Sloan Kettering Medical Center and the Brazilian Ministry of Health. His research focuses on advances and techniques in GI surgery for Crohn’s and Ulcerative Colitis and he has interest in health disparities and preventive medicine. In coordination with members of the department of colorectal surgery, Dr. Greenstein is actively involved in the rollout of the Adrian J. Greenstein IBD surgical database whose goal is to answer important surgical questions and improve patient outcomes.

In the News:

Recommended External Links

Crohn's and Colitis Foundation of America:

Colon and Rectal Cancer Surgery:

Ostomy Information - United Ostomy Associates of America:



American Board of Surgery

Clinical Focus


BA, Yale University

MD, New York Hospital/Cornell University Medical College

MPH, Mount Sinai School of Public Health

Residency, Surgery
New York Presbyterian - Weill Cornell Medical Center

Residency, Preventive Medicine
The Mount Sinai Hospital

Residency, General Surgery
The Mount Sinai Hospital

Fellowship, Laparoscopic Surgery
Oregon Health Sciences University


English, French, Spanish