Mason S. Jon

S. Jon Mason, MD


  • Specialty: Gastroenterology
  • Languages: English, Interpreters Available
  • Gender: Male


Dr. Mason is the senior member of Gastroenterology Specialists of Oregon. A native Oregonian, he earned a Bachelor of Science in pre-medicine from Oregon State University. He received his medical degree from Oregon Health & Science University in 1975. Dr. Mason completed a residency in internal medicine at Good Samaritan Hospital in Portland and received gastroenterology training at Brooke Army Hospital in San Antonio, Texas. He spent the next six years on active duty in the U.S. Army and eventually settled into private practice in 1984.

Dr. Mason educates local physicians and various groups about the science and the practice of gastroenterology.

Education and Certification

  • Medical School: Oregon Health & Science University
  • Residency: Legacy Good Samaritan Medical Center
  • Fellowship: Brooke Army Medical Center

Personal Interests

Walking, Music

Contact Information

  • Practice Name: Gastroenterology Specialists of Oregon

Office Locations

  1. Primary Address
    Gastroenterology Specialists Oregon
    • 19250 SW 90th Ave
    • Tualatin, OR, 97062
    • Phone: 503 692-3750
    • Fax: 503 691-2324
    • Clinic Hours:
    • Weekdays

Hospital Locations

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