All of our doctors are Board Certified in Gastroenterology.  Our physicians are highly trained to diagnosis and treat diseases involving the esophagus, stomach, small intestine, large intestine (colon), liver, gallbladder, and pancreas.

Gastroenterologists are certified by the American Board of Internal Medicine and then receive additional training in Gastroenterology.

Physicians and Nurse Practitioners see patients concurrently; therefore, a patient may be seen by either one of the them for any scheduled office appointment or at the hospital.

Click a name to the left to see a photo and biography.


Clark W. Antonson, M.D., FACG
Erik A. Bowman, M.D.
Andrew D. Coen , M.D.
Mark G. Griffin, M.D.
Matthew J. Hrnicek, M.D.
Bill Lawton, M.D.
David P. Newton, M.D.
James W. Roat, M.D.
Paul F. Petersen, M.D.
Christopher C. Rife, M.D
Michael P. Roth, M.D.
R. James Sorrell, M.D.
J. Reggie Thomas, D.O.
Gary W. Varilek, M.D., FACG
Mark A. Wells, M.D.

Advanced Practice Providers

Lisa Donner, APRN
Cynthia Hammond, APRN, DNP
Kim Hiser, APRN, DNP
Rebecca Jurgens, APRN, DNP
Kristin McQuistan, APRN
Marissa Koch, PA-C
Amy McCracken, APRN, DNP
Alexandra Kohler, PA-C
Jelayna Stauffer, APRN
Jill Beisel, PA-C
Kari Goering, APRN