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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



Ravi J. Patel, M.D.
Undergraduate – BS, University of Michigan Ann Arbor 2005
Medical School – MD, University of Illinois at Chicago 2010

Fellowship trained in Gastroenterology and Hepatology, University of Wisconsin Hospital and Clinics 2017

Fellowship trained in Advanced Endoscopy, University of Wisconsin Hospital and Clinics 2018

Board Certification-

American Board of Internal Medicine 2013

Sitting for American Board of Gastroenterology Fall of 2018


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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