Executive Vice Presidents

J. Gregory Fitz, M.D.

Executive Vice President for Academic Affairs and Provost, Dean of UT Southwestern Medical School and Professor, Department of Internal Medicine

J. Gregory Fitz, M.D.

Holder of the:

  • Nadine and Tom Craddick Distinguished Chair in Medical Science
  • Atticus James Gill, M.D. Chair in Medical Science

Formerly the Chair of Internal Medicine, in 2009 J. Gregory Fitz, M.D., was named Dean of the UT Southwestern School of Medicine and Provost of the Medical Center. A world-renowned hepatologist, Dr. Fitz serves on the executive committee of the American Association for the Study of Liver Diseases. His studies on the cellular mechanisms responsible for regulation of the number, type, and activity of ion channels in liver cells and on the role of ATP as an autocrine/paracrine signal regulating bile formation and other liver functions have been funded by the National Institutes of Health for more than 20 years, including an active MERIT Award. Prior to joining the faculty at UT Southwestern, Dr. Fitz served as Head of the Division of Gastroenterology and Hepatology at the University of Colorado Health Sciences Center and before that as Professor of Medicine and Director of the gastroenterology fellowship program at Duke University Medical Center, where he received his medical degree in 1979.

Mack Mitchell, M.D.

Interim Executive Vice President for Health System Affairs, Vice President for Medical Affairs, and Professor, Department of Internal Medicine

Mack Mitchell, M.D., M.B.A.

Holder of the:

  • Nancy S. and Jeremy L. Halbreich Professorship in Gastroenterology

Mack Mitchell, M.D., was appointed Interim Executive Vice President for Health System Affairs in September 2017. He is responsible for overseeing the UT Southwestern Medical Center clinical enterprise, including the Medical Center’s University Hospitals & Clinics as well as patient-care relationships with Parkland Health & Hospital System and Children’s Healthâ„  Children’s Medical Center Dallas. Since March 2016 he has served as Chief Medical Officer for the Southwestern Health Resources Physician Network and Accountable Care Network. He is Vice President for Medical Affairs at UT Southwestern where he also is a Professor of Internal Medicine. Dr. Mitchell’s clinical and research interests are in gastroenterology and liver diseases. He earned his medical degree from Johns Hopkins University School of Medicine, where he was elected to Alpha Omega Alpha, and he has been listed as one of D Magazine’s Best Doctors in Dallas. Before coming to UT Southwestern, he was the Chief of Gastroenterology and the Medical Director of Ambulatory Services at Johns Hopkins Bayview Medical Center, Chairman of Internal Medicine at Greater Baltimore Medical Center, and Chairman of Medicine at Carolinas Medical Center in Charlotte, North Carolina. He is president of ABMRF/The Foundation for Alcohol Research, and he was honored with the Seixas Award for Distinguished Service by the Research Society on Alcoholism.

Arnim E. Dontes, MBA

Executive Vice President for Business Affairs

Arnim E. Dontes, M.B.A.

Arnim E. Dontes, MBA, Executive Vice President for Business Affairs, has been with UT Southwestern Medical Center since 2011. As the Medical Center’s chief business officer, Mr. Dontes directs the activities of more than 15 business and service-related departments across campus, including Budget and Accounting, Human Resources, Financial Planning, Facilities, Contracts Management, Environmental Health and Safety, General Services, and Purchasing, among others, as well as the University’s police department. Previously, Mr. Dontes served more than 20 years at the University of Illinois College of Medicine — Illinois’ flagship medical school — most recently as the Vice Dean for Administration, where he had financial and operational responsibility for its 30 basic science and clinical units. Mr. Dontes holds a bachelor's degree from the University of Illinois, Champaign, and an MBA from the University of Illinois at Chicago. He was the National Chair-Elect, Chair, and Immediate Past Chair for the Association of American Medical Colleges’ Group on Business Affairs between 2011 and 2014.

Marc A. Nivet, Ed.D., MBA

Executive Vice President for Institutional Advancement

Marc Nivet, Ed.D., M.B.A.

Marc A. Nivet, Ed.D., MBA, is the Executive Vice President for Institutional Advancement at UT Southwestern Medical Center, where he provides strategic vision and oversight in coordinating the areas of Development; Communications, Marketing, and Public Affairs; Government Affairs; and Community and Corporate Relations. Prior to his role at UT Southwestern, Dr. Nivet served as a member of the executive leadership team of the Association of American Medical Colleges, where he provided leadership on issues surrounding community engagement, diversity, and health equity at medical schools and teaching hospitals across the United States and Canada. Dr. Nivet has spent over 20 years in academic medicine developing creative program initiatives and innovative approaches to advance the mission of excellence in research, education, and patient care. Dr. Nivet earned his doctoral degree from the University of Pennsylvania and his MBA from George Washington University’s School of Business. He is a fellow of the New York Academy of Medicine, and a former president of the National Association of Medical Minority Educators.