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Alexander Greenstein

  • ASSISTANT PROFESSOR Population Health Science and Policy
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  • American Board of Surgery


  • MD, Cornell University Medical College

  • BA, Yale University

  • MPH, Mount Sinai School of Public Health

  • Residency, Surgery
    New York Presbyterian - Weill Cornell Medical Center

  • Residency, Preventive Medicine
    Mount Sinai Hospital

  • Residency, General Surgery
    Mount Sinai Hospital

  • Fellowship, Laparoscopic Surgery
    Oregon Health Sciences University


    Dr. Alexander J Greenstein specializes in minimally invasive Ulcerative Colitis, Crohn's and esophageal surgery. Prior to joining our faculty, Dr. Greenstein completed a surgical residency at 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 Medical School.  Dr. Greenstein graduated from Cornell Medical College (NY, NY) Alpha Omega Alpha after completing his bachelor’s degree in Economics Cum Laude with distinction at Yale University (New Haven, CT).  

    Dr. Greenstein is certified by the American Board of Surgery and is a Fellow of the American College of Surgeons (FACS).  He has first or co-authored over 40 peer reviewed manuscripts and has presented his work at both regional and national surgical meetings. Additional research engagements include experiences at the National Institute of Mental Health, the Memorial Sloan Kettering Medical Center and the Brazilian Ministry of Health.  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) and has editorial responsibilities at several journals.

    His interests include minimally invasive gastrointestinal surgery, esophageal motility disorders and inflammatory bowel disease. Dr. Greenstein also has research interest in health policy, preventive medicine and the role of surgery within the public health sphere.

    Dr. Greenstein discussesInflammatory Bowel Disease in the New York Daily News in The Daily Checkup.

    Watch Dr. Greenstein perform a Minimally Invasive Subtotal Colectomy and J-Pouch for Ulcerative Colitis and a Laparoscopic Ileocolic  Resection for Crohn’s Disease.

    Watch Dr. Greenstein's patient tell her story about Ulcerative Colitis on EverydayHealth.

    Read about Dr. Greenstein's patient with appendicitis during pregnancy on ABC News.


  • -
    David A. Dreiling Award for Scholarly Excellence
    Mount Sinai Residency Program

  • -
    Surgical Residents Scholarship Award

  • -
    Cum Laude with Distinction in the Major
    Yale University

  • -
    Alpha Omega Alpha
    Cornell University


Greenstein AJ, Zhang LP, Miller AT, Yung E, Branco BC, Sachar DB, Greenstein AJ. Relationship of the number of Crohn's strictures and strictureplasties to postoperative recurrence. Journal of the American College of Surgeons 2009 Jun; 208(6).

Widmar M, Greenstein AJ, Sachar DB, Harpaz N, Bauer JJ, Greenstein AJ. Small bowel adenocarcinoma in Crohn's disease. Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract 2011 May; 15(5).

Shapiro M, Greenstein AJ, Byrn J, Corona J, Greenstein AJ, Salky B, Harris MT, Divino CM. Surgical management and outcomes of patients with duodenal Crohn's disease. Journal of the American College of Surgeons 2008 Jul; 207(1).

Greenstein AJ, Dolan J, Hunter J. Surgical Management of Non-acid Reflux Unresponsive to Medical Therapy [review]. Difficult Decisions in Thoracic Surgery: An Evidence-Based Approach . M.K Ferguson (Ed.), 2011; London: Springer-Verlag: 257-262.

Greenstein A, Hunter J. Text Update: Minimally Invasive Surgery, Robotics, and Natural Orifice Transluminal Endoscopic Surgery - Impact of Single Incision Laparoscopic Surgery. [review]. Schwartz’s Principles of Surgery, 9e Online Update Series. 2010 March;.

Branco BC, Harpaz N, Sachar DB, Greenstein AJ, Tabrizian P, Bauer JJ, Greenstein AJ. Colorectal carcinoma in indeterminate colitis. Inflammatory bowel diseases 2009 Jul; 15(7).

Grams J, Tong W, Greenstein AJ, Salky B. Comparison of Intracorporeal Versus Extracorporeal Anastamosis in Laparoscopic Hemicolectomy. Surg Endosc 2010 August; 24(8): 1886-1891.

Mazeh H, Greenstein AJ, Swedish K, Nguyen SQ, Lipskar A, Weber KJ, Chin EH, Divino CM. Laparoscopic and open reversal of Hartmann's procedure--a comparative retrospective analysis. Surgical endoscopy 2009 Mar; 23(3).

Greenstein AJ, O'Rourke RW. Abdominal pain after gastric bypass: suspects and solutions. American journal of surgery 2011 Jun; 201(6).

Greenstein AJ, Pham TH, Harrison VL, Sheppard BC, Hunter JG. Minimally Invasive Surgery for Esophageal Cancer. Asian J Endosc Surg 2010; 3: 109-114.

Butala P, Greenstein AJ, Sur MD, Mehta N, Sadot E, Divino CM. Surgical management of acute right lower-quadrant pain in pregnancy: a prospective cohort study. Journal of the American College of Surgeons 2010 Oct; 211(4).

Greenstein AJ, Byrn J, Zhang L, Swedish K, Jahn A, Divino CM. Risk Factors for the Development of Fulminant Clostridium Difficile. Surgery 2008 May; 143(5): 623-629.

Greenstein AJ, Nguyen SQ, Buch KB, Chin E, Weber KJ, Divino CM. Recurrence after Laparoscopic Ventral Hernia Repair: A Prospective Pilot Study of Suture versus Tack Fixation. . Am Surg 2008 March; 74(3): 227-231.

Greenstein AJ, Litle VR, Swanson SJ, Divino CM, Packer S, Wisnivesky JP. Effect of the Number of Lymph Nodes Sampled on Postoperative Survival of Node-Negative Esophageal Cancer. Cancer 2008 March ; 112(6): 1239-1246.

Eisenstein S, Greenstein AJ, Kim U, Divino CM. Cystic duct stump leaks: after the learning curve. Archives of surgery 2008 Dec; 143(12).

Greenstein AJ, Litle VR, Swanson SJ, Divino CM, Packer S, McGinn TG, Wisnivesky JP. Racial Disparities in Esophageal Cancer Treatment and Outcomes.. Annals of Surgical Oncology 2008 March; 15(3): 881-888.

Greenstein AJ, Jacob BP. Placement of a laparoscopic adjustable gastric band after failed sleeve gastrectomy. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery; 4(4).

Mazeh H, Epelboym I, Reinherz J, Greenstein AJ, Divino CM. Tip appendicitis: clinical implications and management. American journal of surgery 2009 Feb; 197(2).

Greenstein AJ, Moskowitz A, Gelijns A, Egorova N. Payer Status and Treatment Paradigm for Acute Cholecystitis. Archives of Surgery;.

Greenstein AJ, Nguyen SQ, Berlin A, Corona J, Lee J, Wong E, Factor SH, Divino CM. Pneumatosis intestinalis in adults: management, surgical indications, and risk factors for mortality. Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract 2007 Oct; 11(10).

Malek MM, Greenstein AJ, Chin EH, Nguyen SQ, Sandler AL, Wong RK, Byrn JC, Katz LB, Divino CM. Comparison of iatrogenic splenectomy during open and laparoscopic colon resection. Surgical laparoscopy, endoscopy & percutaneous techniques 2007 Oct; 17(5).

Greenstein AJ, Aldoroty RA. Parastomal hernia repair using cross-linked porcine dermis: report of a case. Surgery today 2008; 38(11).

Sadot E, Greenstein AJ, Zisman SR. Laparoscopic approach for metachronous cecal and sigmoid volvulus. JSLS : Journal of the Society of Laparoendoscopic Surgeons / Society of Laparoendoscopic Surgeons; 14(4).

Greenstein AJ, Litle VR, Swanson SJ, Divino CM, Packer S, McGinn TG, Wisnivesky JP. Racial disparities in esophageal cancer treatment and outcomes. Annals of surgical oncology 2008 Mar; 15(3).

Greenstein AJ, Litle VR, Swanson SJ, Divino CM, Packer S, Wisnivesky JP. Prognostic significance of the number of lymph node metastases in esophageal cancer. Journal of the American College of Surgeons 2008 Feb; 206(2).

Industry Relationships

Physicians and scientists on the faculty of the Icahn School of Medicine at Mount Sinai often interact with pharmaceutical, device and biotechnology companies to improve patient care, develop new therapies and achieve scientific breakthroughs. In order to promote an ethical and transparent environment for conducting research, providing clinical care and teaching, Mount Sinai requires that salaried faculty inform the School of their relationships with such companies.

Dr. Greenstein did not report having any of the following types of financial relationships with industry during 2015 and/or 2016: consulting, scientific advisory board, industry-sponsored lectures, service on Board of Directors, participation on industry-sponsored committees, equity ownership valued at greater than 5% of a publicly traded company or any value in a privately held company. Please note that this information may differ from information posted on corporate sites due to timing or classification differences.

Mount Sinai's faculty policies relating to faculty collaboration with industry are posted on our website. Patients may wish to ask their physician about the activities they perform for companies.

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