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Our Providers Make The Difference


John G. Mathis, M.D.
Undergraduate-B.A. ·
University of Evansville · 1973

Medical School-M.D. ·
Indiana University · 1976

Fellowship trained in Gastroenterology and Hepatology ·
Indiana University · 1981

Board Certification-
American Board of Internal Medicine · 1979
American Board of Gastroenterology · 1981


Oliver D. Gilliam, M.D., FACG
Undergraduate-B.S. ·
Louisiana State University · 1978

Medical School-M.D. ·
Louisiana State University · 1982

Fellowship trained in Gastroenterology and Hepatology ·
Wayne State University · 1987

Board Certification-
American Board of Internal Medicine · 1986
American Board of Gastroenterology · 1989

Fellowship-American College of
Gastroenterology


Michael A. Manbeck, M.D
Undergraduate-B.A. ·
Earlham College · 1986

Medical School-M.D. ·
The Ohio State University · 1990

Fellowship trained in Gastroenterology and Hepatology ·
Loma Linda University · 1996

Board Certification-
American Board of Internal Medicine · 1993
American Board of Gastroenterology · 1995



Pankaj A. Patel, M.D.

Undergraduate/Medical School-M.D. ·
University of Nigeria · 1993

Fellowship trained in Gastroenterology and Hepatology ·
State University of New York (SUNY), Buffalo · 2002

Masters of Science Epidemiology (MS) ·
SUNY Buffalo · 2001-2002

Board Certification-
American Board of Internal Medicine · 1999
American Board of Gastroenterology · 2003


Thomas R. VanderHeyden, Jr., D.O.

Undergraduate-Associates of Science ·
Prairie State College · 2000

Undergraduate-B.S. ·
Indiana University · 2002

Medical School-D.O. ·
Chicago College of Osteopathic Medicine
at Midwestern University · 2006

Fellowship trained in Gastroenterology and Hepatology ·
Loyola University Medical Center · 2012

Board Certification-
American Board of Internal Medicine · 2009
American Board of Gastroenterology · 2012


Seth Tatel, M.D.
Spanish B.A., University of Illinois at Chicago · 2001
M.D. University of Illinois at Chicago College of Medicine · 2005

Internal Medicine Residency Program, University of Illinois at Chicago Chicago, IL · 2005-2008

Gastroenterology and Hepatology Fellowship Program,
University of Illinois at Chicago
Chicago, IL · 2008-2011

Advanced Endoscopy Fellowship Program (ERCP/EUS),
University of Illinois at Chicago
Chicago, IL · 2011-2012



Desiree Williams, NP

Associate in Science
Riverside Community College · 1993

Associate in Science in Registered Nursing
Riverside Community College · 1995

Bachelor of Science in Nursing
Bethel College · 2010

Master of Science - Family Nurse Practitioner
Indiana University · 2012



Mary Jo Morey, NP

Bachelors of Science in Biology
Saint Mary's College
Notre Dame, IN
Magna Cum Laude · 1983

Bachelors of Science in Nursing
Saint Mary's College
Notre Dame, IN
Magna Cum Laude · 1997

Masters of Nursing, Family Nurse Practitioner Major
Indiana University-Purdue University
Indianapolis, IN · 2002
 

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