1035 Wellington Avenue , Grand Junction, CO 81501

To Schedule an Office Visit: 970.242.6600

About Us

Western Colorado’s Leading Gastroenterology Group


  • Brent Prosser, MD
  • William Shields, DO, FACP, FACG
  • Philip Sarges, MD
  • George Winters, MD, FACP, FACG
  • Eugene Crafton, MD

Physician Assistants

  • Kirsten Boland, PA (ASCP), PA-C
  • Hannah Pick, MPAS, PA-C
Grand Junction Gastroenterology is the largest gastroenterology group serving western Colorado. Our staff currently includes five board certified Gastroenterologists, two Physician Assistants and over 20 employees. Our goal is to provide our patients, referring physicians and the surrounding community with the best, most comprehensive, and highest quality of care possible.

Because gastrointestinal diseases require continuity of care, we strive to align patients with a single gastroenterologist who communicates with you, your primary care clinician, and your other specialists.
A gastroenterologist on staff is always on call for established patients with urgent needs.
Referred patients are evaluated in the clinic in person or by confidential telehealth. Although some testing is done in the clinic, the sedated endoscopies are performed by our physicians at the adjacent endoscopy center, St. Mary’s Hospital, Community Hospital, and Colorado Canyonlands Hospital.

We look forward to helping you.

Our Office Policy

If you need to change or cancel your appointment, please contact us as soon as possible to reschedule. We request a minimum of 24-hour notice for a change concerning your appointment and reserve the right to charge a fee for missed appointments. Please note that appointments scheduled for Monday need to be cancelled by the previous Friday. Payment is due at the time of your appointment. If you have any questions regarding your insurance, please call your insurance company for the most accurate information. If you have any questions or concerns regarding financial arrangements, please call the billing number below.

Our Facility

Our facility is located at 1035 Wellington Avenue in Grand Junction, CO. and within the same building. Our goal is to create a friendly, comfortable environment with physicians specifically trained for your health care needs.

Our Physicians

Brent Prosser
Brent Prosser
Dr. Prosser originally hails from Cheyenne, Wyoming. After receiving his degree in biology from Creighton University in Omaha, NE, he
Eugene Crafton
Eugene Crafton
Dr. Crafton has been helping patients with digestive and liver disease since 1997. After graduating from medical school at the
William Shields
William Shields
Dr Shields is a native of Colorado. He attended Western State Colorado University with a degree in biology followed by
George R. Winters III
George R. Winters III
Dr. Winters graduated from Cornell University and the University of Vermont, College of Medicine. He completed his Internal Medicine residency
Philip Sarges
Philip Sarges
Dr. Sarges has a passion for caring for people with gastrointestinal system disorders. He’s experienced in capsule endoscopy, fecal transplant,

Our Advanced Practice Providers

Kirsten Boland
Kirsten Boland
Kirsten Boland, PA, joined the Grand Junction Gastroenterology team in the fall of 2019, specializing in liver disease diagnosis, care,
Hannah Pick
Hannah Pick
Hannah is a native of Grand Junction, Colorado. She is excited to be back in the Grand Valley with her

Patient Testimonials

Dr. Winters does an excellent job. I have a rare intestinal disease, so I’ve seen several GIs before going to Dr. Winters. He’s par with only one other GI in his care for me and knowledge of my disease.

Tracy D

Just had a colonoscopy with Dr Crafton. Nobody I know relishes the idea of a colonoscopy but I can’t imagine a more pleasant experience than I just had. Dr Crafton was professional, personable and totally put me at ease. Chris was my CRNA and he was equally terrific. My nurses were wonderful and very caring. I would give my highest recommendation to the whole crew at Grand Junction Gastroenterology

Ken P

Best place the doctors and the nurses and everyone in there are so wonderful it's really nice of them to make you feel like family I would recommend this place to just anyone ever talked to thank you all so much.

Michael P

What Sets Us Apart

Team Of Board-Certified Specialists

Providing Personalized & Innovative Gastroenterological Care

Utilizing The Latest & Most Advanced Techniques

Offering Long-Term Patient Follow-Up & Direct Physician Access