The incoming gastroenterologist will join Centennial Gastroenterology Associates, the established GI practice within Centennial Medical Group (CMG), a division of CHI Mercy Health. The current team includes three board-certified gastroenterologists and two advanced practice providers. The group has long tenure across the support staff, a clear practice culture, and an active focus on expanding capacity through the addition of one or more gastroenterologists.
| Provider | Role | Training Highlights |
|---|---|---|
| Sorin Petre, MD | Board-certified Gastroenterologist (Internal Medicine, Gastroenterology, Transplant Hepatology) | Universitatea de Medicina si Farmacie Grigore T. Popa (Iasi, Romania); Residency at Maricopa Integrated Health System (Phoenix, AZ); Fellowship at Mayo Clinic Hospital (Phoenix, AZ) |
| John Walker, MD, FACG | Board-certified Gastroenterologist (part-time, 1099) | University of Texas Southwestern Medical School (Dallas, TX); Fellowship at University of Miami Affiliated Hospitals (Miami, FL) |
| Surin Vasdev, MD | Board-certified Gastroenterologist | University of London (medical school); Fellowship and Residency at Mayo School of Medicine (Rochester, MN); previously practiced in Corvallis and served as assistant professor at Western University of Health Sciences (Lebanon, OR) |
Dr. Petre is the practice's longest-tenured physician and anchors inpatient call coverage. Dr. Vasdev is a full-time employed gastroenterologist who contributes to clinic and endoscopy. Dr. Walker provides part-time 1099 coverage focused on procedural work, adding capacity in the endoscopy suite. The incoming gastroenterologist will share call with the established group and have the latitude to shape both their clinical mix and the practice's broader procedural strategy.
| Provider | Role | Training Highlights |
|---|---|---|
| Shaun McGowan, PA-C | Physician Assistant (5+ years with the practice; focus on hepatology, benign anorectal disease, functional GI disorders) | Undergraduate and Master's in Physician Assistant Studies at Duquesne University (Pittsburgh, PA) |
| Samantha B. Griffin, FNP-C | Family Nurse Practitioner (GI since 2023; 12 years prior RN experience in Critical Care and Cardiac Medicine) | Roseburg High School; Oregon State University (BS Exercise and Sport Science); University of North Alabama (BSN); Saint Joseph's College of Maine (FNP, 2016) |
Both APPs see clinic patients independently and have direct-scheduling authority for procedures, which keeps the physician day focused on procedural and complex case work. The APPs do not take GI call.
Centennial Gastroenterology operates as a tight-knit specialty group with a clinic-focused culture and strong interprofessional collaboration. The team works closely with hospitalist medicine, general surgery, oncology, the Mercy ASC, anesthesia, and emergency medicine. The leadership team is explicit about giving the incoming gastroenterologist a voice in shaping practice workflow, schedule structure, and procedural mix (including the option to perform ERCP for a candidate who wants to dabble).
The Centennial Gastroenterology practice is located at 2510 NW Edenbower Blvd, Suite 112, Roseburg, Oregon 97471. The endoscopy suite and inpatient consults are based at Mercy Medical Center, 2700 NW Stewart Parkway, Roseburg, Oregon 97471.