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Leadership

James Weber, M.D.

Chief Executive OfficerChief Executive Officer, Chairman of the Board
Meet James

Paul J. Berggreen, M.D.

Chief Strategy Officer
Meet Paul J.

J. Casey Chapman, M.D.

GastroenterologistChief Medical Officer
Physician Executive

Chief Medical Officer
Meet Jonathon

Kate Conklin

Chief Ethics and Compliance Officer
Meet Kate

Dina Dunn

Chief People Officer
Meet Dina

Bill Kayser

Chief Financial Officer
Meet Bill

Gregory TenBarge

Chief Revenue Officer
Meet Gregory

James Weber, M.D.

Chief Executive OfficerChief Executive Officer, Chairman of the Board
Meet James

Paul J. Berggreen, M.D.

Chief Strategy Officer
Meet Paul J.

Mitchell Bernsen, M.D.

GastroenterologistGovernor of Midwest Division (IGG)
Meet Mitchell

Joseph Cappa, M.D.

GastroenterologistGovernor of Northeast Division (CTGI)
Meet Joseph

J. Casey Chapman, M.D.

GastroenterologistChief Medical Officer
Physician Executive

Chief Medical Officer
Meet Jonathon

Harish Gagneja, M.D.

GastroenterologistGovernor of South Texas Division (AG)Physician Executive
Meet Harish

Kumar Gutta, M.D.

GastroenterologistGovernor of Central Division (TDDC)Physician Executive
Meet Kumar

L. Phillips Jenkins, M.D.

Member At-Large (GGE)
Meet Phillips

Ronald P. Kotfila, M.D.

GastroenterologistGovernor of Southeast Division (GIA-MS)
Meet Ronald

Kevin Liebovich, M.D.

GastroenterologistMember At-Large (IGG)
Meet Kevin

Jeffry Nestler, M.D.

GastroenterologistGrowth and Development Officer
Meet Jeffry

Eric Newton, M.D.

Member At-Large (UGI)
Meet Eric

Zarema Singson, M.D.

GastroenterologistMember At-Large (GCSA)
Meet Zarema

Jason Sugar, M.D.

GastroenterologistMember At-Large (WAGI)
Meet Jason

Jay Yepuri, M.D.

GastroenterologistMember At-Large (DHAT)
Meet Jay

J. Casey Chapman, M.D.

GastroenterologistChief Medical Officer
Physician Executive

Chief Medical Officer
Meet Jonathon

Parag H. Chokshi, M.D.

GastroenterologistPhysician Executive
Meet Parag

Esmail Elwazir, M.D.

GastroenterologistPhysician Executive
Meet Esmail

Nancy Farrar, P.A.

Clinical Information Executive
Meet Nancy

Harish Gagneja, M.D.

GastroenterologistGovernor of South Texas Division (AG)Physician Executive
Meet Harish

Sarita Gayle, M.D.

GastroenterologistPhysician Executive
Meet Sarita

Kumar Gutta, M.D.

GastroenterologistGovernor of Central Division (TDDC)Physician Executive
Meet Kumar

Reed Hogan, M.D.

GastroenterologistPhysician Executive
Meet Reed

Rajeev Jain, M.D.

GastroenterologistPhysician Executive
Meet Rajeev

Pradeep Kumar, M.D.

GastroenterologistPhysician Executive
Meet Pradeep

Joseph Losurdo, M.D.

GastroenterologistPhysician Executive
Meet Joseph

Walker McDonald, M.D.

GastroenterologistPhysician Executive
Meet Walker

Timothy Ritter, M.D.

GastroenterologistPhysician Executive
Senior Medical Research Director
Meet Timothy

Jason Roberts, M.D.

GastroenterologistPhysician Executive
Meet Jason

Jonathan Rosenberg, M.D.

GastroenterologistPhysician Executive
Regional Medical Research Director
Meet Jonathan

Harry Sarles, M.D.

GastroenterologistSenior Associate Medical Director
Physician Executive

Senior Associate Medical Director
Meet Harry

Ramsey K. Umar, M.D.

GastroenterologistPhysician Executive
Meet Ramsey

Our GI Alliance Research Team is comprised of individuals motivated to do what is best for our patients and lead a highly skilled team to address your specific needs.

Physician Leadership

George E. Catinis, M.D.

Gastroenterologist
Education Program Director
Meet George

J. Casey Chapman, M.D.

GastroenterologistChief Medical Officer
Physician Executive

Chief Medical Officer
Meet Jonathon

Timothy Ritter, M.D.

GastroenterologistPhysician Executive
Senior Medical Research Director
Meet Timothy

Jonathan Rosenberg, M.D.

GastroenterologistPhysician Executive
Regional Medical Research Director
Meet Jonathan

Harry Sarles, M.D.

GastroenterologistSenior Associate Medical Director
Physician Executive

Senior Associate Medical Director
Meet Harry

Chirag D. Trivedi, D.O.

Gastroenterologist
Regional Medical Director
Meet Chirag

Administrative Leadership

Matthew Burkemper

Senior Research Director

Melinda Dollar-Wilson

Director of QA/QC

Rosanna Vazquez

Director of Finance

Nicole Rodriguez

Program Coordinator

Milhen James

Contracts Manager

Amanda Hatley

Education Coordinator

Jo Ann Gilbert

Regulatory Manager
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