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Donald R. Hopkins, M.D., M.P.H.
Vice President, Carter Center Health Programs

Dr. Donald R. Hopkins directs all of the health programs of The Carter Center. He first joined the Center in 1987 as the senior consultant for the health programs where he led the Center's efforts to eradicate Guinea worm disease and river blindness worldwide. Dr. Hopkins' professional experience includes serving as deputy director (1984-1987) and acting director (1985) of the Centers for Disease Control and Prevention.  He was an assistant professor of tropical public health at Harvard School of Public Health, and he directed the Smallpox Eradication/Measles Control Program in Sierra Leone, West Africa.

Dr. Hopkins attended the Institute of European Studies at the University of Vienna. He received his Bachelor of Science from Morehouse College, his Doctor of Medicine from the University of Chicago, and his Master of Public Health from the Harvard School of Public Health. He is board certified in pediatrics and in public health and has been a member of seven United States delegations to the World Health Assembly.
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Ernesto Ruiz-Tiben, Ph.D.
Director, Guinea Worm Eradication Program

Dr. Ruiz-Tiben joined The Carter Center in 1992 after more than 27 years of service as a commissioned officer of the U.S. Public Health Service at the Centers for Disease Control and Prevention. Since 1998 Dr. Ruiz-Tiben has served as director of the Carter Center's Guinea Worm (Dracunculiasis) Eradication Program. In this capacity, he works in conjunction with the World Health Organization Collaborating Center for Research, Training, and Eradication of Dracunculiasis at the CDC, monitoring and disseminating information about the status of the global campaign and providing technical assistance to national eradication programs.

During his tenure at CDC, Dr. Ruiz-Tiben headed the Helminthic Disease Branch, Division of Parasitic Disease, National Center for Infectious Diseases. He has worked to control the disease schistosomiasis in Puerto Rico, the Dominican Republic, Suriname, Brazil, Egypt, and Liberia and dengue fever in the Caribbean area. For this outstanding work, he received special commendations from the U.S. Public Health Service. Additionally, in recognition of his contributions to the global initiative to eradicate dracunculiasis, the CDC in 1990 awarded him the U.S. Public Health Service's Outstanding Service Medal.

Dr. Ruiz-Tiben received the Bachelor of Science degree from Catholic University in Puerto Rico. He holds a Master of Science degree from the University of Puerto Rico School of Public Health and a doctorate in epidemiology from the University of Texas School of Public Health at Houston.
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P. Craig Withers, M.B.A., M.H.A.
Director of Program Support, Carter Center Health Programs

As director of program support, Mr. Withers manages and directs international development activities in health and food security in 19 African and Latin American countries. He has worked on Guinea worm eradication in Sudan and Nigeria and as a regional technical adviser in Burkina Faso for The Carter Center.

Mr. Withers has more than 30 years experience in public health policy. He received a Master of Business Administration in international business and a Master of Health Administration in health planning from Georgia State University and a Bachelor of Science from the University of Notre Dame. His honors include awards for work done as special assistant to the deputy director of the National Institute for Occupational Safety and Health program at the Centers for Disease Control and Prevention.


Kelly Callahan, M.P.H.
Assistant Director of Program Support, Carter Center Health Programs

Ms. Callahan is a liaison to the Carter Center's health programs and field offices through management and leadership as well as technical and financial support. Before accepting her current position at the Carter Center's headquarters, Ms. Callahan headed up the Center's southern Sudan office, targeting Guinea worm eradication, trachoma control, and river blindness control.

Ms. Callahan acquired extensive field experience from frequent trips in and out of Sudan and served as an elected representative on the U.N.'s umbrella organization, Operation Lifeline Sudan. During this time, Ms. Callahan's accomplishments included leading the Carter Center's effort to distribute more than 9 million pipe filters in the fight against Guinea worm disease and the implementation of the Carter Center-assisted Trachoma Control Program. Ms. Callahan's international health experience began with two years of service in Cote D'Ivoire with the U. S. Peace Corps.

Ms. Callahan received a Bachelor of Arts degree from the University of Cincinnati. She majored in earth sciences and communications with special concentration in the independent research of Orcinus Orca in British Columbia, Canada. She was awarded the Master of Public Health degree from Rollins School of Public Health at Emory University in 2010. Watch: Kelly Callahan at TEDxAtlanta >


Adam Weiss
Assistant Director, Guinea Worm Eradication Program
Mr. Weiss served as a Carter Center technical adviser to national Guinea worm eradication programs in Ethiopia and Ghana between 2005 and 2011, where he provided technical and program management support for all interventions to stop the transmission Guinea worm disease. Prior to joining The Carter Center, Mr. Weiss was a U.S. Peace Corps volunteer in Ghana, focusing on improving access to water and sanitation facilities, increasing awareness about HIV/AIDS, strengthening community based health education, and assisting in the eradication of Guinea worm disease.

In his role as assistant director of the Guinea Worm Eradication Program, Mr. Weiss continues to provide technical support for the national programs of South Sudan, Mali, Chad, and Ethiopia.

Mr. Weiss graduated cum laude from Ripon College with a Bachelor of Arts degree in anthropology and politics and government in 2003.  He currently is pursuing a Master of Public Health degree in prevention science from the Rollins School of Public Health at Emory University.


Renn McClintic-Doyle
Office Manager, Guinea Worm Eradication Program
As office manager with primary responsibility for the Guinea Worm Eradication Program, Renn McClintic-Doyle maps disease prevalence; archives publications; produces newsletters, journal articles, and health education flip charts; coordinates foreign travel; and works with overseas consultants. 

In 2002, Ms. McClintic-Doyle was named Advocate of the Year by the Atlanta Alliance for Developmental Disabilities for her work with fetal alcohol syndrome.  She serves on the board of directors for  Parkwood Farms Therapy Center and is an advisory board member of the National Organization on Fetal Alcohol Syndrome of Georgia.  She was one of the first foster parents for HIV+ infants in the state.

With the Carter Center's Global 2000 program since 1990, Ms. McClintic-Doyle is pursuing a bachelor's degree in Health Care Administration from the University of Phoenix.


Lauri Hudson-Davis
Administrative Assistant,
River Blindness, Guinea Worm, Lymphatic Filariasis, Schistosomiasis, and Malaria Programs

Ms. Hudson-Davis acts as a liaison between program staff, field offices, and consultants.  She coordinates annual program meetings and other events, compiles and edits program reports, and provides support to travelers.  She also takes on special projects and occasionally visits programs in the field to collect data on program performance.  Ms. Hudson-Davis graduated cum laude from Centenary College New Jersey in 2005 with a Bachelor of Science degree in business management.