Our Team
Timothy H. Holtz, Redstone Chair, and Director
Timothy H. Holtz, M.D., M.P.H., was appointed as the Redstone Chair, and Director of the Sumner M. Redstone Global Center for Prevention and Wellness, in July 2024. A noted global health epidemiologist and leader, Dr. Holtz has devoted a majority of his career to international primary care and infectious disease prevention research, including vector borne diseases,
tuberculosis and drug-resistant tuberculosis, HIV/AIDS and TB among persons with HIV.
From 2019–2024, Dr. Holtz served as the Deputy Director of the Office of AIDS Research at the National Institutes of Health (NIH), Office of the NIH Director. Prior to his appointment to the NIH, Dr. Holtz served in global HIV and TB research, prevention, and control programs overseas as a country program director for both CDC’s Division of HIV/AIDS Prevention and Division of Global HIV and TB. Dr. Holtz was also an adjunct Associate Professor of Global Health at the Rollins School of Public Health, Emory University.
In January 2020, the U.S. Commissioned Corps Headquarters, responsible for the administration and response coordination of the U.S. Public Health Service (USPHS), announced the promotion of Dr. Holtz to the rank of Rear Admiral in the Commissioned Corps of the USPHS. As a Commissioned Corps flag officer, Dr. Holtz also had the title and responsibilities of an Assistant Surgeon General in the USPHS (2020–2024). He is the recipient of the USPHS Distinguished Service Medal, two Outstanding Service Medals, and eleven Foreign Duty Service awards, among others.
Dr. Holtz received a B.A. in chemistry from St. Olaf College in 1986, an M.D. from the University of Iowa Carver College of Medicine in 1991, and an M.P.H. in International Health from Johns Hopkins Bloomberg School of Public Health. He completed a residency in Internal Medicine (Primary Care) at Harvard Medical School, a fellowship in Health and Human Rights at Columbia University Vagelos College of Physicians and Surgeons, and the Epidemic Intelligence Service fellowship training and a residency in Preventive Medicine at the CDC.
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Dr. Sarah Dumas, Research Scientist
Maya Rao, Senior Center Specialist
XuanHa Nguyen, Administrative Associate
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To further deepen engagement within the Milken Institute SPH and amplify work across departments and the broader university community, the Redstone Center established an Internal Advisory Group (IAG) in 2015. Members meet annually to provide strategic support and guidance on the Center’s projects and plans.
Kelly Gebo, M.D., M.P.H., Michael and Lori Milken Dean
Lynn R. Goldman, M.D., M.S., M.P.H., Professor of Environmental and Occupational Health
Manya Magnus, M.P.H., Ph.D., Professor & Chair of the Department of Epidemiology
Susan Anenberg, M.S., Ph.D., Professor & Chair of the Environmental and Occupational Health Department
Anne Rossier Markus, J.D., Ph.D., MHS, Professor & Chair of the Department of Health Policy and Management
The work of the Redstone Center is guided by an External Advisory Group (EAG), which meets on an annual basis to provide direction and recommendations. Created in December 2015, the EAG has helped to define Redstone’s scope of work and identify new opportunities, including special consideration of policy development and implementation.
- Dr. Afrin Iqbal
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Global Health
Dr. Afrin Iqbal, MPH, is a doctoral student in the Global Public Health Sciences with research interest focusing in health systems implementation, health service delivery, improving both coverage and quality of health services. She is joining the Redstone Global Center as a Graduate Research Assistant in Fall 2025.
- Katherine O'Brien
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Environmental and Occupational Health
Katherine O’Brien, MPH, is a doctoral student in the Department of Environmental and Occupational Health, with research interests centering on climate change, infectious disease prevention and transmission, and health equity. She is joining the Redstone Global Center as a Graduate Research Assistant in Fall 2025.