Duman Jeffrey

Jeffrey D. Duman, MD


  • Specialty: Gastroenterology
  • Clinical Interests: Biliary Disease, Colon Cancer Screening, Colonoscopy, Esophageal Disease, Hepatitis, Inflammatory Bowel Disease, Liver Disease, Pancreatic Disease, Video Capsule Endoscopy
  • Languages: English, Interpreters Available
  • Gender: Male


Dr. Duman completed his undergraduate degree in biology at the University of Texas at Austin. He received his medical degree from the University of Texas Health Science Center at Houston and was accepted into the national medical honor society, Alpha Omega Alpha. He completed his three-year internal medicine residency, as well as a three-year gastroenterology fellowship at the University of Colorado Health Sciences Center.

Dr. Duman has a special interest in disorders of the esophagus and improving colon cancer prevention. Before joining Gastroenterology Specialists of Oregon, he conducted research in several areas including gender disparities in liver transplantation recipients and outcomes of patients with gastrointestinal bleeding. Over the years he has presented the results of his research at several national scientific meetings and published in leading scientific journals.

In his free time, Dr. Duman enjoys road biking, skiing, jogging, and spending time with his wife and son.

Education and Certification

  • Medical School: University of Texas, Health Science Center
  • Residency: University of Colorado Health Science Center
  • Internship: University of Colorado Health Science Center
  • Fellowship: University of Colorado Health Science Center

Personal Interests

Road Biking, Skiing, Running

Contact Information

  • Practice Name: Gastroenterology Specialists of Oregon

Office Locations

  1. Primary Address
    Gastroenterology Specialists of Oregon
    • 1003 Providence Dr., Ste 315
    • Newberg, OR, 97132
    • Phone: 503-692-3750
    • Fax: 503 691-2324
  2. Secondary Address
    Gastroenterology Specialists of Oregon
    • 19250 SW 90th Ave.
    • Tualatin, OR, 97062
    • Phone: 503 692-3750
    • Fax: 503 691-2324

Hospital Locations

  1. Primary Address
    Legacy Meridian Park Medical Center
    • 19300 SW 65th Avenue
    • Tualatin, Oregon, 97062
    • Phone: 503-692-1212