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Leadership
James Weber, M.D.
Chief Executive OfficerChief Executive Officer, Chairman of the Board
Benjamin Griffith
President
Paul J. Berggreen, M.D.
Chief Strategy Officer
J. Casey Chapman, M.D.
GastroenterologistChief Medical Officer
Physician Executive
Chief Medical Officer
Physician Executive
Chief Medical Officer
Kate Conklin
Chief Ethics and Compliance Officer
Dina Dunn
Chief People Officer
Bill Kayser
Chief Financial Officer
Gregory TenBarge
Chief Revenue Officer
James Weber, M.D.
Chief Executive OfficerChief Executive Officer, Chairman of the Board
Paul J. Berggreen, M.D.
Chief Strategy Officer
Mitchell Bernsen, M.D.
GastroenterologistGovernor of Midwest Division (IGG)
Joseph Cappa, M.D.
GastroenterologistGovernor of Northeast Division (CTGI)
J. Casey Chapman, M.D.
GastroenterologistChief Medical Officer
Physician Executive
Chief Medical Officer
Physician Executive
Chief Medical Officer
Harish Gagneja, M.D.
GastroenterologistGovernor of South Texas Division (AG)Physician Executive
Kumar Gutta, M.D.
GastroenterologistGovernor of Central Division (TDDC)Physician Executive
L. Phillips Jenkins, M.D.
Member At-Large (GGE)
Ronald P. Kotfila, M.D.
GastroenterologistGovernor of Southeast Division (GIA-MS)
Kevin Liebovich, M.D.
GastroenterologistMember At-Large (IGG)
Jeffry Nestler, M.D.
GastroenterologistGrowth and Development Officer
Eric Newton, M.D.
Member At-Large (UGI)
Zarema Singson, M.D.
GastroenterologistMember At-Large (GCSA)
Jason Sugar, M.D.
GastroenterologistMember At-Large (WAGI)
Jay Yepuri, M.D.
GastroenterologistMember At-Large (DHAT)
J. Casey Chapman, M.D.
GastroenterologistChief Medical Officer
Physician Executive
Chief Medical Officer
Physician Executive
Chief Medical Officer
Parag H. Chokshi, M.D.
GastroenterologistPhysician Executive
Esmail Elwazir, M.D.
GastroenterologistPhysician Executive
Nancy Farrar, P.A.
Clinical Information Executive
Harish Gagneja, M.D.
GastroenterologistGovernor of South Texas Division (AG)Physician Executive
Sarita Gayle, M.D.
GastroenterologistPhysician Executive
Kumar Gutta, M.D.
GastroenterologistGovernor of Central Division (TDDC)Physician Executive
Reed Hogan, M.D.
GastroenterologistPhysician Executive
Rajeev Jain, M.D.
GastroenterologistPhysician Executive
Pradeep Kumar, M.D.
GastroenterologistPhysician Executive
Joseph Losurdo, M.D.
GastroenterologistPhysician Executive
Walker McDonald, M.D.
GastroenterologistPhysician Executive
Timothy Ritter, M.D.
GastroenterologistPhysician Executive
Senior Medical Research Director
Senior Medical Research Director
Jason Roberts, M.D.
GastroenterologistPhysician Executive
Jonathan Rosenberg, M.D.
GastroenterologistPhysician Executive
Regional Medical Research Director
Regional Medical Research Director
Harry Sarles, M.D.
GastroenterologistSenior Associate Medical Director
Physician Executive
Senior Associate Medical Director
Physician Executive
Senior Associate Medical Director
Ramsey K. Umar, M.D.
GastroenterologistPhysician Executive
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
Education Program Director
J. Casey Chapman, M.D.
GastroenterologistChief Medical Officer
Physician Executive
Chief Medical Officer
Physician Executive
Chief Medical Officer
Timothy Ritter, M.D.
GastroenterologistPhysician Executive
Senior Medical Research Director
Senior Medical Research Director
Jonathan Rosenberg, M.D.
GastroenterologistPhysician Executive
Regional Medical Research Director
Regional Medical Research Director
Harry Sarles, M.D.
GastroenterologistSenior Associate Medical Director
Physician Executive
Senior Associate Medical Director
Physician Executive
Senior Associate Medical Director
Chirag D. Trivedi, D.O.
Gastroenterologist
Regional Medical Director
Regional Medical Director
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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