Walter A. Orenstein served as the director of the United States' National Immunization Program, from May 1993 to January 2004.
He then completed a residency in pediatrics at the University of California, San Francisco, after which he completed a fellowship in infectious diseases at the University of Southern California Medical School.
He has also served as a consultant to the World Health Organization and the Pan American Health Organization,[1] and was formerly the Assistant Surgeon General of the United States Public Health Service, as well as the CDC liaison member to the National Vaccine Advisory Committee for over 14 years.
He has served on the Board of Directors of Vaccinate Your Family for over two decades, offering his scientific and medical expertise.
[2] He is currently a professor of infectious diseases at Emory University, a post he was originally appointed to in March 2004[3] and then held until October 2008, after which he became affiliated with the Bill and Melinda Gates Foundation, where he served as deputy director of immunization programs before returning to Emory in September 2011.