Our Providers

Craig E. Chamberlain, MD
Jonathan Gonenne, MD
Amy Littlejohn, PA-C
Peter S. Kay, MD
Jonathan J. Myers, DO
Page M. Crenshaw, FNP, CGRN
William C. Wu, MD
Shane J Mills, MD
Alison Nance, NP
Donald K Yang, MD
Davis L. Sim, MD, PhD
 

 

Our Mission Statement

Eugene Gastroenterology Consultants collectively commit to serve the entire community by providing care of the highest quality as an independent single-specialty group. Patient and referral physician satisfaction will be of paramount importance. We will maintain individual commitments, physician flexibility and responsiveness to the needs of patients, partners and employees.

The physicians and staff of Eugene Gastroenterology are committed to providing the Gold Standard of care and services to our patients and referring physicians. Established in 1977, we are the largest medical group specializing in gastroenterology south of Portland. All of our doctors are board certified in a full range of diagnostic and therapeutic gastrointestinal procedures.  We look forward to serving you soon.

Craig E. Chamberlain, MD

Craig E. Chamberlain, MD

Dr. Craig Chamberlain graduated Phi Beta Kappa from the University of Oregon with a B.A. in biology and then received his M.D. degree from Oregon Health Sciences University in Portland in 1978. He completed his residency training at Wilford Hall USAF Medical Center in San Antonio, Texas, and subsequently completed fellowship training in gastroenterology at Walter Reed Army Hospital in 1989. He is Board certified in both internal medicine and gastroenterology. He came to Eugene in 1991 and initially worked at the Eugene Clinic until 1995.

Dr. Chamberlain then joined Eugene Gastroenterology Consultants. His specialty interests include peptic ulcer disease, Helicobacter pylori, and inflammatory bowel disease. He performs routine endoscopic procedures with the exception of ERCP. His non-medical interests include sports, skiing, golfing, and traveling.

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Peter S. Kay, MD

Peter S. Kay, MD

Dr. Peter Kay graduated from Columbia University with a B.A. in chemistry and then received his M.D. degree from the University of Chicago Pritzker School of Medicine in 1991. He completed his residency and fellowship training in internal medicine and gastroenterology at Stanford University.

Dr. Kay then joined Eugene Gastroenterology in 1997. His specialty interests include inflammatory bowel disease, irritable bowel syndrome, and gastrointestinal malignancies. His non-medical interests include fishing, hiking, collecting art/antiques, and traveling.

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William C. Wu, MD

William C. Wu, MD

Dr. Wu completed his undergraduate and medical education at the University of Washington. He attended the University of Colorado Health Sciences University for his Internal Medicine residency, then to the Oregon Health Sciences University for his sub-specialty training in Gastroenterology/Hepatology.

Although Dr. Wu has been in private practice since 1994, he has been in Eugene since 1999. His professional interests include prevention and early detection of colorectal cancer, and performance of challenging endoscopic procedures (such as therapeutic biliary endoscopy - ERCP). Dr. Wu's free time is devoted to his family, enjoying the outdoors, and playing Pickleball. His Christian faith is a strong source of comfort and encouragement. He is an active member of the University Fellowship Church.

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Donald K. Yang, MD

Donald K. Yang, MD

Donald K. Yang, M.D. received his B.A. in Biochemistry at the University of Pennsylvania magna cum laude. He remained at the University of Pennsylvania for medical school to receive his M.D. degree. Dr. Yang then attended Stanford University for Internship and Residency in Internal Medicine. He completed his fellowship in Gastroenterology at the University of California, San Francisco, (UCSF).

Dr. Yang is board certified in Internal Medicine and Gastroenterology. Beyond general Gastroenterology and hepatology, his special clinical interests include colorectal cancer prevention, inflammatory bowel disease, and endoscopic therapy of the biliary tract and pancreas. Outside of medicine, Donald and his wife, Elaine, are kept busy with a growing family. His non- medical interests include snowboarding, golf, and other outdoor activities.

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Jonathan Gonenne, MD

Jonathan Gonenne, MD

Jonathan Gonenne, M.D. graduated Phi Beta Kappa from the University of North Carolina, Chapel Hill, majoring in Biology and Political Science. He received his M.D. at McGill University in Montreal, Canada. Jonathan then moved to Nashville, Tennessee where he completed an internal medicine residency at Vanderbilt University Medical Center and then worked as a hospitalist for Baptist Hospital. He completed a Gastroenterology fellowship at Mayo Clinic of Rochester, Minnesota and advanced endoscopy training at Beth Israel Hospital/Harvard in Boston, Massachusetts.

Jonathan is board certified in Gastroenterology. Particular GI interests include gastrointestinal/pancreatic cancer and endoscopic ultrasound, hepatobiliary disease, and inflammatory bowel disease. Jonathan likes to spend as much time possible exploring Oregon with his wife and daughters. He also enjoys tennis and blues harmonica.

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Jonathan J. Myers, DO

Jonathan J. Myers, DO

Jonathan J. Myers, DO graduated from Gannon University majoring in Biology. He received his Doctor of Osteopathic Medicine at Philadelphia College of Osteopathic Medicine. Jonathan did his Internal Medicine residency at Dwight D. Eisenhower Army Medical Center, and then practiced as a General Medical Officer for one year in South Korea with the US Army. He completed his Gastroenterology Fellowship at Brooke Army Medical Center with a focus on Endoscopic Ultrasound (EUS) and subsequent Advanced Endoscopy Training at Beth Israel Deaconess Medical Center/Harvard in Boston, Massachusetts. Dr. Myers is board certified in Internal Medicine and Gastroenterology. His Gastroenterology specialty interests include gastrointestinal malignancies, inflammatory bowel disease and advanced endoscopy therapy. Outside of work, he enjoys racquetball, biking, spending time with his family and dog.

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Shane J. Mills, MD

Shane J. Mills, MD

Dr. Shane Mills graduated with a B.S. in Biology from Davidson College in 1995 and received his M.D. from the University of South Alabama College of Medicine in 2000.  Shane did his Internal Medicine residency at Tripler Army Medical Center in Hawaii, where he received the William J. Uphouse Award for compassionate patient care.  After serving as Chief of Medical Residents at Tripler, he completed his Gastroenterology fellowship at Brooke Army Medical Center in San Antonio, Texas with a focus on ERCP (therapeutic biliary endoscopy).  He proudly served as Chief of Gastroenterology at William Beaumont Army Medical Center from 2008-2013.  Dr. Mills was selected by his peers as the 2012 Eddy Palmer Endoscopy Award recipient, which recognizes excellence in endoscopy.  His speciality interests include colorectal cancer screening and prevention, liver disease (chronic hepatitis C), inflammatory bowel disease, and endoscopic therapy of the biliary tract.  Outside of work, he enjoys spending time with his wife and children.  He is an avid football fan and also enjoys tennis, photography, and sketching.

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Davis L. Sim, MD, PhD

Davis L. Sim, MD, PhD

Dr. Davis Sim graduated with a B.S. in physiological sciences from University of California Los Angeles in 2000 and received his medical degree and PhD in immunology from University of Virginia in 2009. He completed his internal medicine residency at Johns Hopkins Hospital in Baltimore in 2012 and subsequently completed his sub-specialty training in gastroenterology at Stanford Hospital in 2015. His particular interests include inflammatory bowel disease and gastrointestinal malignancies. His outside interests include spending time with his wife and 2 children, swimming, running, and cooking.

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Amy Littlejohn, PA-C

Amy Littlejohn, PA-C

Amy Littlejohn, PA-C has been working in GI within our community for the last 11 years. Amy graduated with a BA in Biology from WIlliam Woods University in Missouri and received her Masters of Physician Assistant Studies degree from Oregon Health & Sciences University in 2004. Her specialty interests include capsule endoscopy and motility disorders. Her personal interests include collecting medical antiquities, sewing and 1960's vintage decor. She obtained the title of Master Food Preserver through the OSU Extension Office.

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Page M. Crenshaw, FNP, CGRN

Page M. Crenshaw, FNP, CGRN

Page Crenshaw, FNP was born in Memphis Tennessee and enjoyed living around the United States as the daughter of a Navy veteran. She earned a Bachelors of Science in Nursing from Oregon Health & Sciences University and completed her Master’s of Science in Nursing at University of Alabama in Birmingham with a specialty in Family Practice. She is board certified with American Nurses Credentialing Center, and is a certified gastroenterology nurse.  Page has enjoyed nursing for over 20 years with more than 10 of those years in the field of gastroenterology. Her personal interests include golfing, camping and traveling.

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Alison Nance, NP

Alison Nance, NP

Alison Nance, NP is a nationally certified Nurse Practitioner who obtained her Bachelor of Arts from New York University in 2001 and Masters in Nursing from Pacific Lutheran University in 2009. Prior to obtaining her Masters in Nursing, she worked in Kosovo for local NGOs. She has seven years of Family Practice/Internal Medicine experience. She likes reading, taking long walks with her dog, gardening, cribbage, and spending time with her husband and 2 daughters.

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