Faculty and Current Fellows

Current Faculty

David A. Lieberman, M.D.

Professor of Medicine
Chairman, Division of Gastroenterology/Hepatology

Undergraduate education: University of Michigan
MD: University of Michigan
Residency/Chief Residency: Oregon Health & Science University
GI Fellowship: Oregon Health & Science University
Research interests: Colon cancer screening, Barrett's esophagus, Outcomes in endoscopy

Atif Zaman, M.D., MPH

Professor of Medicine
Vice Chair of Clinical Programs, Department of Medicine
Section Chief, Division of Gastroenterology and Hepatology
Undergraduate education: Boston University
MD: Tufts University
Residency: Baylor College of Medicine
GI Fellowship: Oregon Health & Science University
Research interests: Portal hypertension, Endoscopic Research, Gastrointestinal hemorrhage, Outcomes Research, Epidemiologic Research, Hepatitis C

Joseph Ahn, M.D., M.S., FACG, AGAF

Associate Professor of Medicine
Director of Clinical Hepatology
Undergraduate: Northwestern University
MD: Northwestern University
Residency: University of Chicago
GI Fellowship: Northwestern University
Research Interests: Hepatitis B, Hepatitis C, Liver transplantation

Michael F. Chang, M.D., MSc

Associate Professor of Medicine
Section Chief,Gastroenterology and Hepatology Portland VAMC
Undergraduate education: Boston University, College of Arts and Sciences
MD: Boston University School of Medicine
Masters of Science: Boston University School of Public Health
Residency: Boston University IM Residency Program
GI Fellowship: Boston University
Hepatology Fellowship: Beth Israel Deaconess Medical Center

Judith F. Collins, M.D.

Professor of Medicine
Section Chief, Gastroenterology, Portland VAMC
Medical Director, Inflammatory Bowel Disease Clinic

Undergraduate education: Duke University
MD: Medical University of South Carolina
Residency: Medical University of South Carolina
GI Fellowship: Oregon Health & Science University/University of California at Los Angeles
Research interests: Inflammatory bowel disease, Colonic neoplasia

Silvio de Melo, M.D., AGAF, FACG

Associate Professor of Medicine
MD: Universidad Federal de Pernambuco, Brazil
Residency: UT Southwestern Medical Center
GI Fellowship: UT Southwestern Medical Center
Advanced Endo Fellowship: Mayo Clinic Jacksonville
Research interests: Interventional Endoscopy (EUS, ERCP, Deep Enteroscopy, Complex polypectomy)

Sarah Diamond, M.D.

Assistant Professor of Medicine
MD: University of Miami
Residency: Oregon Health & Science University
Chief Residency: Oregon Health & Science University
GI Fellowship: Oregon Health & Science University
Research interests: Clinical nutrition, gastrointestinal motility

 Brintha K Enestvedt, M.D., MBA

Assistant Professor of Medicine
Undergraduate education: University of North Carolina - chapel hill
MD: Northwestern University Feinberg School of Medicine
MBA: Northwestern University Kellogg School of Management
Residency: Oregon Health & Science University
GI Fellowship: Oregon Health & Science University
Advanced endoscopy fellowship: University of Pennsylvania
Research interests: Gender differences in practice, Therapeutic Endoscopy, Clinical outcomes related to endoscopy, EUS, Fellowship training

M. Brian Fennerty, M.D.

Professor of Medicine
Undergraduate education: University of New York, Albany
MD: Creighton University
Residency: Naval Hospital, San Diego
GI Fellowship: Arizona Health Sciences Center
Research interests: Gastroesophageal reflux disease, Helicobacter pylori, Barrett's esophagus, Pharmacoeconomics, Outcomes Research, Therapeutic Endoscopy, Metaanalyses, Esophageal Motility, Endoscopy

Tim Gebhart, DNP, FNP-C

Instructor/Physicians Assistant
Undergraduate education: Oregon Health and Science University
Masters of Nursing: Oregon Health and Science University
Doctor of Nursing Practice: Oregon Health and Science University
Masters of Business Administration: Oregon Health and Science University
Expertise: Digestive Health, Medicine
 

Janice Jou, M.D., MHS

Assistant Professor of Medicine
Program Director, Gastroenterology and Hepatology Fellowship
Undergraduate education: Northwestern University
MD: Northwestern University Medical School
Residency: University of Wisconsin Hospital and Clinics, Madison, WI
GI and Transplant Hepatology Fellowship: Duke University Medical Center
Research interests: Hepatocellular carcinoma, Health services research in liver disease

Ronald Katon, M.D.

Professor of Medicine
Undergraduate education: University of Vermont
MD: Chicago Medical School
Residency: Oregon Health & Science University
GI Fellowship: Oregon Health & Science University/University of California at Los Angeles
Research interests: Ultrathin endoscopy, Variable stiffness colonoscopy, Argon beam endoscopic,therapy, Biliary/pancreatic endoscopy

 

William Mark Kelley, M.D.

Assistant Professor of Medicine
Undergraduate Education: University of Michigan
MD: Stanford University Medical School
Residency: University of Michigan
Fellowship: University of Virginia
Research Interests: Irritable Bowel Syndrome, Cohn's Disease, Ulcerative Colitis, Celiac Disease, Esophageal problems