Team

Gerald Engstrom, MD

Gerald Engstrom, MD is a gastroenterologist and is board certified by the American Board of Internal Medicine in Gastroenterology and Internal Medicine.

He completed his residency for Internal Medicine at University of Wisconsin School of Medicine. His fellowship in gastroenterology was completed at University of California Irvine College of Medicine.

In his practice, Dr. Engstrom provides routine screenings, to diagnostic GI evaluations for more serious health issues. He and his office staff are committed to serving all patients with dignity and respect.

For more than 25 years, Dr. Engstrom has been expertly serving the needs of physicians and patients throughout Douglas County.

Sorin Petre, MD

Sorin Petre, MD is a gastroenterologist and board certified by the American Board of Medicine in Internal Medicine; Gastroenterology and Transplant Hepatology.

He graduated from Universitatae de Medicina si Farmacie Grigore T Popa, Lasi, Romania. Dr. Petre also completed his residency in Internal Medicine at Maricopa Integrated Health System in Phoenix, Arizona and his fellowship at the Mayo Clinic Hospital in Phoenix, AZ.

Shaun McGowan, PA-C

Shaun McGowan PA-C received his undergraduates and masters degree in Physician Assistant Studies at Duquesne University Pittsburgh, PA. Shaun specializes in the management of hepatology, benign anorectal diseases, and functional disorders. In his spare time, Shaun enjoys snowboarding, rock climbing, and spending time outside exploring his new home.

John Walker, MD, FACG

John Walker, MD, FACG is a gastroenterologist and board certified by the American Board of Medicine in Internal Medicine and Gastroenterology.

He graduated from University of Texas Health Science Center Southwestern Medical School, in Dallas, Texas. Dr. Walker completed his Fellowship in Gastroenterology at the University of Miami Affiliated Hospitals in Miami, Florida

In his spare time, Dr. Walker enjoys working out, hiking, traveling and spending time with his family and dogs.

Surin Vasdev, MD

Surin Vasdev, MD is a gastroenterologist and board certified by the American Board of Medicine in Gastroenterology.

He graduated from University of London and completed his Fellowship and Residency in Gastroenterology at the Mayo School of Medicine in Rochester, MN.

Dr. Vasdev practiced in the Corvallis area and has been an assistant professor at Western University of Health Sciences in Lebanon, OR. He joins Centennial Gastroenterology with multiple years in the field and is excited to explore Douglas County.

In his spare time, Dr. Vasdev enjoys painting, hiking, biking, and studying history.