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Chief of the Gastrointestinal Division

Roscoe Bennett Gray Cowper, MD, Distinguished Professor

The Hollywood Reporter

Hollywood’s Top Doctors:
4 NYC-Based Physicians Loved by L.A.

September 2014


Procedures for malignant and benign diseases of the colon, rectum, and anus including colon, rectal and anal cancer; inflammatory bowel disease; rectal prolapse; diverticulitis; risk-reducing surgery for Lynch Syndrome; Polyposis Syndromes; young-onset and other forms of inherited colorectal cancer with a focus on minimally invasive techniques including laparoscopic, robotic and transanal microscopic surgery leading to preservation of gastrointestinal, bladder and sexual function.


Hereditary and early age-of-onset colorectal cancer; assessment of rectal cancer response to preoperative therapy.


  • MBA: Brandeis University, Waltham, MA 2019
  • Colorectal Surgery Fellowship: Lahey Clinic Medical Center, Burlington, MA 1990 – 1991
  • Research Fellowship: Columbia Presbyterian Medical Center, New York, NY 1985 – 1987
  • Residency: Columbia Presbyterian Medical Center, New York, NY 1983 – 1990
  • MPH: Yale University School of Medicine, New Haven, CT 1988
  • MD: Yale University School of Medicine, New Haven, CT 1983
  • BA: New York University, New York, NY 1978


Surgery – Board Certified, 1991
Colon and Rectal Surgery – Board Certified, 1994


Search for publications on PubMed using Guillem J* as search criteria


A Story Twenty-Five Years in the Making  | February 2, 2021

The year was 1995, and Maria Frangella was a 27-year-old New Jersey native. A young woman looking forward to getting married to her future husband and best friend. Life had other plans for Maria, instead, she spent the year fighting colorectal cancer which led to her helping other young patients and fundraising for cancer research. Read more about Maria’s story.

  • Phone Numbers

    (919) 966-8436 (Office Phone)

  • (919) 966-8440 (Fax)

  • Address

    Division of GI Surgery, CB #7081

    UNC Department of Surgery

    Chapel Hill, NC 27599-7081