AGA Leadership

AGA Institute Governing Board

The AGA Institute Governing Board guides the organization in implementing its strategic plan. Get to know our 2022-2023 board members.



John M. Carethers, MD, AGAF
University of Michigan Health System
Ann Arbor, Michigan
Dr. Carethers' profile in Gastroenterology

John M. Carethers, MD, AGAF, received his bachelor’s degree in biological sciences and his medical degree from Wayne State University in Detroit. Dr. Carethers completed his residency at Massachusetts General Hospital in Boston followed by his gastroenterology fellowship at University of Michigan in Ann Arbor. After establishing his career at the University of California, San Diego, Dr. Carethers returned to the University of Michigan Health System in 2009 to take on his current position as the John G. Searle professor of internal medicine and chair of the department of internal medicine.

Dr. Carethers’ research programs focus on familial colon cancer and polyposis syndromes including familial adenomatous polyposis (FAP). These research activities have also focused on hereditary nonpolyposis colorectal cancer (HNPCC), juvenile polyposis, hyperplastic polyposis and colorectal cancer.

An active member of AGA for more than 20 years, Dr. Carethers was the recipient of the AGA Gastrointestinal Oncology Section Research Mentor Award as well as the AGA Distinguished Mentor Award in 2017. Dr. Carethers has served on several AGA committees, including the AGA Nominating Committee, AGA Underrepresented Minorities Committee, AGA Research Policy Committee, AGA Institute Council and early in his career on the AGA Trainee & Young GI Committee. He has also served as section editor of Gastroenterology. Dr. Carethers joined the AGA Governing Board in June 2020 as vice president and assumed the role of president in May 2022.



Barbara Jung, MD, AGAF
University of Washington
Seattle, Washington

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Barbara Jung, MD, AGAF, is a professor and chair of medicine at the University of Washington in Seattle. As a practicing gastroenterologist and physician-scientist, her expertise in gastrointestinal disease is extensive, and her research interests range from basic to clinical science. She completed her medical degree with thesis at the Ludwig-Maximilians University in Munich, Germany. She then moved to the U. S. and completed post-doctoral studies in colon cancer at the Sidney Kimmel Cancer Center in San Diego, California under the mentorship of Dr. Michael McClelland. She completed both her internal medicine residency and gastroenterology fellowship at the University of California in San Diego in 2004 under the mentorship of Dr. John Carethers.

Dr. Jung’s research interests are far ranging and include both clinical and basic research. Her clinical focus is in hereditary GI diseases, and she leads a multidisciplinary, personalized high-risk GI cancer clinic with an associated registry. Her NIH-funded laboratory centers on TGF family member signaling in GI disease, including colorectal cancer and pancreatitis. Her research centers on the mechanisms of GI epithelial cell growth and motility and specifically the modulation of growth suppressive and pro-migratory signaling by TGF family members, primarily activin. Her work in pancreatitis focuses on the relationship between activin signaling and inflammation. Dr. Jung has a strong record of fostering research collaboration between basic, translational and clinical research. Her passion for training the next generation of clinicians is evidenced by her participation in mentoring events including acting as an Invited Mentor for the AGA Task Force on Mentoring; she was the co-chair/chair of the AGA Academic Skills Workshops in 2016 and 2018.

Dr. Jung has a diverse history of service within AGA. She has volunteered for terms on multiple committees including finance and operations, nominating and research policy, among others. She has chaired the ethics committee and the audit committee, and has been an associate editor or on the editorial board of multiple AGA publications.

Vice President

Vice President

Maria T. Abreu, MD, AGAF
University of Miami Miller School of Medicine
Miami, Florida

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Maria T. Abreu, MD, AGAF, received her medical degree from the University of Miami Miller School of Medicine, Florida. She then completed her residency in internal medicine at Brigham and Women’s Hospital, Boston, Massachusetts, and her gastroenterology fellowship at UCLA School of Medicine, where she also completed her post-doctoral fellowship in molecular and cancer biology. In 2008, Dr. Abreu returned to the University of Miami Miller School of Medicine, serving as chief of gastroenterology from 2008-2016. She currently serves as the director of the Crohn’s and Colitis Center as well as the vice chair for research for the department of medicine.

Dr. Abreu’s research focuses on inflammatory bowel disease (IBD) and colorectal cancer. She has also operationalized the “University of Miami IBD Center Clinical Phenotype Database and Tissue Repository,” which includes one of the largest numbers of Hispanic samples in the U.S. She has more than 100 publications and has received numerous honors, such as the Distinguished Clinician Award in the department of medicine for the University of Miami.

Dr. Abreu has made numerous contributions to AGA, most notably serving as the former chair of the AGA Institute Council, which plans AGA’s programming for Digestive Disease Week® (DDW). She has served on many AGA committees, including the nominating committee, public affairs and advocacy committee, and the committee for under-represented minorities.



John Allen (retired), MD, MBA, AGAF
University of Michigan
Ann Arbor, Michigan

John I. Allen MD, MBA, AGAF, received his bachelor’s degree from Rice University. He obtained his medical degree from the University of New Mexico School of Medicine. He completed internal medicine and gastroenterology training at the University of Minnesota and spent ten years on its academic faculty, serving at the Minneapolis VA Medical Center as a grant-funded researcher in colorectal cancer. In 1991, he joined a Twin-Cities-based private gastroenterology practice and, over the ensuing 20 years, helped build Minnesota Gastroenterology into one of the largest GI practices in the country. As Medical Director and Director of Quality, he led the development of their nationally known quality program. In 2001, he returned to school and obtained an MBA in Medical Group Management from the University of St Thomas in Minneapolis. In 2013, he left private practice to become clinical chief of digestive diseases and professor of medicine at Yale University School of Medicine. In 2016, he moved to the University of Michigan School of Medicine (Ann Arbor, Michigan) as a clinical professor of medicine and clinical chief of gastroenterology. The following year, he became the chief clinical officer of the University of Michigan Medical Group, helping oversee the $2 billion ambulatory care infrastructure at Michigan Medicine.

John also has been a leader at Allina Health, a large non-profit health system in Minnesota and Wisconsin. He has served as chair of both the Quality and Population Health Committee and system-wide Credentialing Committee, sits on the Audit and Finance Committee and the Board of Directors (both ending in 2021). From 2006-2009, he chaired the Board of Directors of the Institute for Clinical Systems Improvement in Minnesota.

John has been an active member of AGA for over 40 years. He has served in multiple leadership roles, including Community Practice Councillor, chair of the Clinical Practice and Quality Management Committee, Foundation Board member, and several guideline committees. Dr. Allen was president of AGA from 2014-2015 and has returned to the AGA Governing Board as secretary/treasurer (2022-26). He is the former editor in chief of GI and Hepatology News and was awarded the Julius Friedenwald Medal in 2019 — AGA’s highest award for lifetime achievement in gastroenterology.

Past President

Past President

John M. Inadomi, MD, AGAF
University of Utah School of Medicine
Salt Lake City, Utah

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John M. Inadomi, MD, AGAF, received a bachelor’s degree in mechanical engineering from the Massachusetts Institute of Technology. He obtained his medical degree from the University of California, San Francisco (UCSF), followed by an internal medicine residency and gastroenterology fellowship at UCSF. Dr. Inadomi has been on the faculty at the University of New Mexico, the University of Michigan, UCSF, the University of Washington, and the University of Utah where he is the Jon M. Huntsman Presidential Chair and Chair of the Department of Internal Medicine.

Dr. Inadomi’s research interests include comparative effectiveness analysis and health services/outcomes research. His current focus is optimizing management of Barrett’s esophagus, and improving screening to reduce mortality from colorectal cancer. His NIH research portfolio includes CISNET, a consortium of computer simulation scientists who conduct comparative effectiveness studies of competing management strategies to reduce cancer mortality; a collaboration between basic, translational and clinical investigators to reduce mortality from esophageal adenocarcinoma; and a project to test innovative interventions to improve adherence to cancer screening tests.

John has been an active member of AGA for more than 25 years and has served as the chair of the Clinical Practice and Quality Management Committee, chair of the Clinical Practice section of the AGA Council, Director of the AGA/AASLD Academic Skills Workshop, and Co-Director of the AGA Post-Graduate Course. He is currently an associate editor for Gastroenterology. He served on the governing board as the clinical research councillor from 2015 to 2018 and in 2019 was elected to the AGA governing board as vice president. Dr. Inadomi served as the president of AGA during 2021.

At-Large Councillor

At-Large Councillor

Kim E. Barrett, PhD, AGAF
UC Davis School of Medicine
Sacramento, California

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Kim E. Barrett, PhD, AGAF, was appointed the vice dean for research at the UC Davis School of Medicine in November 2021. In this role, Barrett is responsible for implementing key initiatives and fostering partnerships across UC Davis Health, while also leading the medical school’s collaborative efforts to develop UC Davis’ Aggie Square research program.

Barrett is an internationally recognized scholar in gastrointestinal physiology and has published extensively and received numerous awards for her academic contributions as well as her teaching, administrative skills and mentoring. Her research interests have centered on the physiology and pathophysiology of the intestinal epithelium and their relevance to inflammatory bowel diseases and diarrheal diseases, and have resulted in more than 300 publications.

A native of the United Kingdom, Barrett received her Bachelor of Science and doctoral degree from University College London. Following a post-doctoral fellowship at the National Institutes of Health, she joined the faculty of UC San Diego School of Medicine in 1985 and became a professor of medicine in 1996. During her tenure at UC San Diego, Barrett held numerous leadership roles including the dean of the Graduate Division and the vice chair for research in the Department of Medicine.

Barrett has served in leadership roles at AGA throughout her career, and is the former chair of the AGA Publications Committee, the AGA Ethics and Audit Committees, and served twice as director of the Academic Skills Workshop. She was recognized with AGA’s top research award, the AGA Distinguished Achievement Award in Basic Science in 2021.

At-Large Councillor for Development and Growth

At-Large Councillor for Development and Growth

Lawrence Kosinski, MD, MBA, AGAF
Chicago, Illinois

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A serial entrepreneur and thought leader in the world of value-based payment, Lawrence Kosinski, MD, MBA, AGAF, currently serves as chief medical officer of SonarMD, the leading value-based care coordination solution for complex chronic diseases. He founded SonarMD in 2014 to make it easier for specialists and patients to work together to manage symptomatic chronic illness and prevent clinical deterioration, improving health outcomes and lowering the cost of care. 

Kosinski has more than 35 years of experience practicing gastroenterology in suburban Chicago. He began his career in a small, three-physician GI practice and built it along with others into the state’s largest, the 50-physician Illinois Gastroenterology Group.

Dr. Kosinski serves on CMS’ Physician-Focused Payment Model Technical Advisory Committee (PTAC) to help develop bold, new Medicare payment models. He has been an active member of AGA for nearly 40 years, and serves as Councillor At-Large for Development and Growth.

Dr. Kosinski earned his MD from Loyola University Stritch School of Medicine and an MBA from Northwestern University Kellogg School of Management.

Basic Research Councillor

Basic Research Councillor

Nicholas O. Davidson, MD, DSc, AGAF
Washington University School of Medicine
St. Louis, Missouri

Nicholas Davidson, MD, DSc, AGAF, received his medical degree from King’s College, University of London in England. Dr. Davidson completed his internship at King’s College Hospital and residency at Queen Elizabeth Hospital, in Birmingham, England. He then undertook research training at Rockefeller University, New York and completed his gastroenterology fellowship training at Columbia Presbyterian Medical Center (New York Presbyterian Medical Center).

Dr. Davidson is currently the John E. and Adaline Simon professor of medicine and division director of gastroenterology at Washington University School of Medicine in St. Louis, Missouri. He also serves as the PI/director of the P30 Digestive Disease Research Core Center and the T-32 training grant in academic gastroenterology at Washington University in which he oversees and directs strategic allocation of resources and enabling technology in advancing studies of host environmental interactions in digestive and liver disease.
Prior to his recruitment to Washington University, he served as director of the Gastroenterology Fellowship Program at the University of Chicago and was co-director of the University of Chicago Medical Scientist Training Program.

His long standing basic-translational research program focuses on the role of gatekeeper genes that regulate intestinal and hepatic lipoprotein assembly and secretion, including apoB and microsomal triglyceride transfer protein (Mttp). These research activities have focused on the molecular genetics of intestinal lipid transport, enterohepatic bile acid signaling and nonalcoholic fatty liver disease. Dr. Davidson’s clinical-translational interests have focused on various aspects of colorectal cancer, including inherited and familial syndromes. These studies aim to advance understanding of disparities and poverty in outcomes of colorectal cancer patients, looking specifically at neighborhood and geographic impact.

Dr. Davidson is an active member of AGA, previously serving as chair of the AGA Institute Council Section for Basic and Clinical Intestinal Disorders and the AGA Research Policy Committee and Research Awards Panel. AGA has honored Dr. Davidson with the AGA Institute Council Section Research Mentor Award and AGA Research Foundation Scholar Award funded by GlaxoSmithKline. This is Dr. Davidson’s second time on the governing board; he previously served on the AGA Institute Governing Board 2002-2004.

Clinical Research Councillor

Clinical Research Councillor

Andrew T. Chan, MD, MPH, AGAF
Harvard Medical School
Boston, Massachusetts

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Andrew T. Chan, MD, MPH, AGAF received his ScB from Brown University, medical degree from Harvard Medical School, and master of public health from the Harvard T. H. Chan School of Public Health (HSPH). He did his internal medicine residency and chief residency, followed by gastroenterology fellowship at Massachusetts General Hospital (MGH), where he remains on faculty. He is professor of medicine at HMS, professor of immunology and infectious diseases at HSPH, chief of the clinical and translational epidemiology unit at MGH and the director of epidemiology at the MGH Cancer Center. He is the former program director of the MGH GI Fellowship Program. Dr. Chan is a gastroenterologist and a leading investigator in cancer prevention, supported as an Outstanding Investigator of the National Cancer Institute, Team Leader for the Stand Up to Cancer Gastric Cancer Interception Team, and by grants from the National Institute for Diabetes and Digestive and Kidney Diseases and the National Institute on Aging.

An elected member of the American Society for Clinical Investigation and the Association of American Physicians, he has published over 500 papers in the field of colorectal cancer and other chronic digestive diseases in leading journals, including the NEJM, JAMA, Lancet, Science, Nature Medicine, Gastroenterology and Gut.

Dr. Chan is a section editor for Gastroenterology, and serves on the editorial board of JNCI, Cancer Prevention Research, Cancer Epidemiology Biomarkers and Prevention. He is past chair of the Gastrointestinal Oncology Section of the AGA Institute Council, past chair of the AGA Institute Research Policy Committee, is a past member of the GRG Steering Committee and has served as a member of the AGA Institute Clinical Practice and Quality Measures Committee, Training Subcommittee, and AGA Nominating Committee. He also chairs the Molecular Epidemiology Group of the American Association for Cancer Research (AACR).

Practice Councillor

Practice Councillor

Naresh Gunaratnam, MD, AGAF
Huron Gastro Center for Digestive Care
Ypsilanti, Michigan

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Naresh Gunaratnam, MD, AGAF, completed his GI fellowship at the University of Michigan and an advanced endoscopy fellowship at the Mayo Clinic. He has served as president of the Michigan GI society for seven years and currently serves on the executive board of Digestive Health Physician Association as chair of data analytics. He joined Huron Gastro in Ann Arbor Michigan in 1999 and established the EUS program. He has authored over 50 peer reviewed publications and book chapters while in private practice and co-authored an article entitled “Establishing an Effective Weight Loss Program in a Community Practice” (Clinical Gastro August 2019, Volume 17:9:1669-72). He served on the AGA task force to develop obesity treatment as a service line. The Huron Gastro Wellness program addresses nutrition, fitness, sleep and mental health to holistically approach weight loss. He is a strong believer that gastroenterologists should provide obesity management as a service line.

He was awarded the AGA distinguished clinician award (physician in private practice) in 2019 and was elected the president and CEO of Huron Gastro in 2021. Dr. Gunaratnam has been a member of the AGA Institute Practice Management and Economics Committee, Obesity Task Force, AGA Public Affairs and Advocacy Committee and the AGA Trainee and Young GI Committee. His outside interests include being president of the non-profit which runs an orphanage for 40 girls in Sri Lanka (  He is married to Dr. Aruna Sarma and they have two college aged children, Nikhil and Sejal.

Practice Councillor

Practice Councillor

Michael L. Weinstein, MD, AGAF
Capital Digestive Care, LLC
Chevy Chase, Maryland

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Michael Weinstein, MD, AGAF, began his career in private practice gastroenterology in 1985. He led the development of one the first ambulatory endoscopy centers to receive Medicare certification in 1986. His interest in the early addition of technology into medical practice includes adoption of video endoscopy in 1989, development of endowriter software with cMore (ProVation) and gMed, and as a former AMA CPT Advisory Panel representative, aided Given Imaging, Medtronics and Ethicon in requesting new CPT codes for technology innovations. In 2009, he spearheaded the merger of seven practices to form Capital Digestive Care and is now president and CEO of a practice of 69 physicians in the Washington, D.C., and suburban Mid-Atlantic region. He has a special interest in independent physician advocacy and is the immediate past president of the Digestive Health Physician Association and the clinical counselor on the AGA Governing Board.

He is an active fundraiser for the AGA Foundation that supports young investigator gastroenterology research and has helped lead Capital Digestive Care to be the principle sponsor for the Crohn’s and Colitis Foundation’s Greater Washington DC Chapter.

Capital Digestive Care and PE (formerly Physicians Endoscopy) recently launched PE Practice Solutions, a unique, physician-oriented management service organization aligned with the interests of gastroenterologists in independent practice. Dr. Weinstein is serving as the medical director of the new MSO. PE Practice Solutions partners with gastroenterologists in private practice, providing advanced operational support with access to experts, information and tools to grow.

Education & Training Councillor

Education & Training Councillor

Sheryl Pfeil, MD, AGAF
The Ohio State University Wexner Medical Center
Columbus, Ohio

Sheryl A. Pfeil, MD received her bachelor’s degree from Miami University and her medical degree from The Ohio State University College of Medicine. She completed her residency in Internal Medicine and her fellowship in Gastroenterology at University Hospitals, Case Western Reserve University in Cleveland, Ohio. After beginning her career at Case Western Reserve University, she joined the faculty at The Ohio State University where she is currently a professor of medicine and practicing gastroenterologist.

Dr. Pfeil has 30 years of experience in medical education, leading medical student, resident and fellow education. She is the director of the Clinical Skills Education and Assessment Center at Ohio State and has received the Master Clinician, Master Educator and Lifetime Achievement Award in Education. Her educational research interests include professional development, training and assessment methods, and virtual education.

She has been an AGA member for 30 years, serving on the Education and Training Committee, the Advisory Council (past Chair) for the Academy of Educators, as Co-Chair of the Future Leaders Program and on the editorial board for Gastro Hep Advances. In 2022, she joined the AGA Institute Governing Board as the education and training councillor.

AGA Research Foundation Chair

AGA Research Foundation Chair

Michael Camilleri, MD, AGAF
Mayo Clinic
Rochester, Minnesota

Michael Camilleri is a consultant in the Division of Gastroenterology and Hepatology at Mayo Clinic in Rochester, Minnesota, and is professor of medicine, pharmacology, and physiology at Mayo Clinic College of Medicine and Science. His research interests include clinical enteric neurosciences, gut neurohormonal control, obesity, irritable bowel syndrome, and pharmacology and pharmacogenomics; his work is funded by NIH. He has received numerous awards and honors including the 2012 Ismar Boas Medal from the German Society of Digestive and Metabolic Disease, the 2012 American Gastroenterological Association (AGA) Distinguished Mentor Award, the Janssen Research Award, the AGA Joseph B. Kirsner Award, the AGA Julius Friedenwald Medal in 2021, as well as honorary doctorates from the University of Antwerp (Belgium) and the University of Malta, and he was elected to the membership of the prestigious Association of American Physicians.

Dr. Camilleri participates in educational and mentorship activities at Mayo Clinic and has mentored more than 80 national and international postdoctoral fellows and scientists. He maintains an active clinical practice in gastroenterology at Mayo Clinic, specializing in gastrointestinal motility disorders, gastroparesis and functional GI disorders.

Dr. Camilleri is past-president of the American Neurogastroenterology and Motility Society and AGA, former editor of Clinical Gastroenterology and Hepatology and Neurogastroenterology and Motility, and is currently an associate editor of American Journal of Physiology.

2021 John M. Inadomi, MD, AGAF
2020 M. Bishr Omary, MD, PhD, AGAF
2019 Hashem B. El-Serag
2018 David A. Lieberman
2017 Sheila E. Crowe
2016 Timothy C. Wang
2015 Michael Camilleri
2014 John I. Allen
2013 Anil K. Rustgi
2012 Loren Laine
2011 C. Richard Boland
2010 Ian L. Taylor
2009 Gail A. Hecht
2008 Robert S. Sandler
2007 Nicholas F. LaRusso
2006 Mark Donowitz
2005 David A. Peura
2004 Emmet B. Keeffe
2003 Daniel K. Podolsky
2002 Martin Brotman
2001 Jon I. Isenberg
2000 Thomas A. Brasitus
1999 Ralph A. Giannella
1998 Donald O. Castell
1997 Phillip P. Toskes
1996 Tadataka Yamada
1995 James W. Freston
1994 John H. Walsh
1993 Don W. Powell
1992 Walter J. Hogan
1991 Sidney Cohen
1990 David H. Alpers
1989 Eugene D. Jacobson
1988 Robert M. Glickman
1987 John M. Dietschy
1986 Douglas B. McGill
1985 Jerry S. Trier
1984 Norton J. Greenberger
1983 Thomas R. Hendrix
1982 John T. Farrar
1981 Malcolm P. Tyor
1980 Frank P. Brooks
1979 Robert M. Donaldson, Jr.
1978 William Silen
1977 John A. Benson, Jr.
1976 Marvin H. Sleisenger
1975 Fred Kern, Jr.
1974 Kurt J. Isselbacher
1973 Albert I. Mendeloff
1972 Henry D. Janowitz
1971 Nicholas C. Hightower
1970 James A. Clifton
1969 Stewart G. Wolf
1968 Thomas C. Chalmers
1967 Morton I. Grossman
1966 Wade Volwiler
1965 Joseph B. Kirsner
1964 Charles F. Code
1963 Thomas P. Almy
1962 G. Gordon McHardy
1961 Franz J. Ingelfinger
1960 Hugh R. Butt
1959 H. Marvin Pollard
1958 Clifford J. Barborka
1957 Mandred W. Comfort
1956 S. Allen Wilkinson
1955 Robert Elman
1954 Dwight L. Wilbur
1953 Julian M. Ruffin
1952 A.M. Snell
1951 T. Brier Miller
1950 John G. Mateer
1949 J. Arnold Bargen
1948 Albert F.R. Anderson
1947 Henry L. Bockus
1946 Walter L. Palmer
1945 A.H. Aaron
1944 A.H. Aaron
1943 Sara M. Jordon
1942 Sara M. Jordon
1941 Russel S. Boles
1940 Andrew C. Ivy
1939 Irvin Abell
1938 Ernest H. Gaither
1937 Chester M. Jones
1936 Ralph C. Brown
1935 Howard F. Shattuck
1934 B.B. Vincent Lyons
1933 John Bryant
1932 Burrill B. Crohn
1931 Clement R. Jones
1930 Ludwig Kast
1929 Frank Smithies
1928 Walter C. Alvarez
1927 George M. Piersol
1926 Franklin W. White
1925 Charles G. Lucas
1924 A.F. Chace
1923 David Riesman
1923 R.W. Mills, MD (died in office)
1922 G.B. Eusterman
1921 A.A. Jones
1920 Joseph Sailer
1919 T.R. Brown
1918 W.A. Bastedo
1917 J.A. Lichty
1916 W.G. Morgan
1915 C.G. Stockton
1914 W.C. Bloodgood
1913 J. Kaufmann
1912 J. Kaufmann
1911 W.B. Cannon
1910 W.B. Cannon
1909 J. Friedenwald
1908 J. Friedenwald
1907 J.P. Sawyer
1906 H.W. Bettman
1905 H.W. Bettman
1904 S.J. Meltzer
1903 S.J. Meltzer
1902 J.C. Hemmeter
1901 J.C. Hemmeter
1900 Max Einhorn
1899 Max Einhorn
1898 D.D. Stewart
1897 C.G. Stockton