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William O'Malley, M.D.

Contact Information

Phone Numbers

Appointment: (585) 341-0366

Office: (585) 341-0366

Fax: (585) 341-0681

URMFGA member of the University of Rochester Medical Faculty Group

groupAn Accountable Health Partner

assignmentAccepting New Patients

Faculty Appointments

Field of Clinical Practice



Professional Background

Dr. O'Malley is an Assistant Professor of Clinical Surgery at the University of Rochester Medial Center and the Director of Bariatric Surgery at Highland Hospital. He has been a bariatric surgeon since 1997 and has performed nearly 4,000 bariatric surgical procedures. He introduced Laparoscopic Bariatric surgery to the region in 2000.

He was certified by the American Board of Surgery in 1997.

Dr. O'Malley performs multiple types of Bariatric procedures depending on an individual patients need. He is experienced in Laproscopic Gastric Bypass, Open Gastric Bypass, Laparascopic Duodenal Switch, Open Duodenal Switch, Banded Gastroplasty, Laparascopic Gastric Banding and Laparoscopic Sleeve Gastrectomies. Dr. O'Malley performs the largest number of Bariatric procedures in New York.

Dr O'Malley has traveled within the Region and internationally to teach and demonstrate advanced Laproscopic techninques in Bariatric Surgery. He has mentored and trained numerous surgeons to perform Bariatric Surgery profession. Recently, Dr. O'Malley has been featured on the Oprah Winfrey show and was asked to contribute to Good Housekeeping/Redbook magazine in 2009 as a subject matter expert.

Dr. O'Malley is actively involved in improving the Quality of patient care at Highland Hospital. He has been Co-Chair of the Surgical Quality Committee and is a Surgical Representative for the Credentialing Committee. He is the Medical Director of the Bariatric Fellowship program.

- Dr. O'Malley is a member of the Fellow American College of Surgeons 1999-Present
- Rochester Surgical Society, 1999- Present ( Past President)
- Monroe County Medical Society 2001-Present
- American Society of Metabolic and Bariatric Surgery, 2001-Present



  • Surgery - American Board of Surgery


BA | University of Rochester

MD | Stony Brook Univ Health Sciences Center School of Medicine

Post-doctoral Training & Residency

09/01/1992 - 06/30/1996
Residency in Surgery at Univ. of Rochester School of Medicine and Dentistry

09/01/1991 - 06/30/1992
Internship in Surgery at SUNY at Buffalo


Journal Articles

Ahmed, A. R., G. Rickards, S. Husain, J. Johnson, W. O'Malley, and T. Boss. "Bioabsorbable glycolide copolymer staple-line reinforcement decreases internal hernia rate after laparoscopic Roux-en-Y gastric bypass". Obes Surg. 2008; 18: 797-802.

Gusenoff, J. A., S. Messing, W. O'Malley, and H. N. Langstein. "Temporal and demographic factors influencing the desire for plastic surgery after gastric bypass surgery". Plast Reconstr Surg. 2008; 121: 2120-2126.

Ahmed, A. R., G. Rickards, S. Messing, S. Husain, J. Johnson, T. Boss, and W. O'Malley. "Roux limb obstruction secondary to constriction at transverse mesocolon rent after laparoscopic Roux-en-Y gastric bypass". Surg Obes Relat Dis. 2008; .