Biography & Education


"The best part of my job is getting to know my patients in order to care for them better. The disease process is what we have to manage, but knowing the patient well enables us to approach the process together as a team. Not every medical problem has the same answer for each person and knowing the person gets us to the right answer. I really enjoy caring for my patients and love the relationship we have developed over the years."

Dr. Sheffield received his Bachelor of Arts in biology from the University of California, Riverside. He attended medical school in Guadalajara, Mexico, and returned to the U.S. to finish his education. He earned his medical degree at the University of California, Irvine, School of Medicine, where he also completed his residency. He completed a fellowship in gastroenterology at the University of New Mexico in Albuquerque. Dr. Sheffield joined Gastroenterology Specialists of Oregon (now The Oregon Clinic - Gastroenterology South) in 1993.
Dr. Sheffield speaks fluent Spanish. 
Dr. Sheffield is married and has three children. His family is very involved in the community, schools and their church. Dr. Sheffield enjoys any time with his wife. They travel and stay involved in marriage ministry at their church. He will never be found far from his iPad or whatever the newest Apple product is. 
Areas of expertise

Colon Cancer Screening and Prevention, Gastroesophageal Reflux Disease (GERD), Inflammatory Bowel Disease (IBD), Esophageal Manometry, Diseases of the Liver and Biliary Tract

  • BA, Biology, University of California Riverside, Riverside, CA, 1981
  • Diploma-Physician & Surgeon, Autonomous University of Guadalajara, Guadalajara, Jalisco, Mexico, 1986
  • Fifth Pathway Certification, University of California Irvine, Long Beach, CA, 1998
  • Internal Medicine Residency, University of California Irvine, Long Beach VA Medical Center, Long Beach, CA, 1998 - 1991
  • Gastroenterology Fellowship, University of New Mexico, Albuquerque, NM, 1991 - 1993
  • English
  • Spanish

Care Locations

The Oregon Clinic-Gastroenterology South at Tualatin
19250 SW 90th Ave.
Tualatin , OR 97062
Fax 503-692-2324