George Siber has served as Executive Vice President and Chief Scientific Officer of Wyeth Vaccines, or Wyeth. While at Wyeth, Dr. Siber oversaw the development and approval of multiple widely-used childhood vaccines, including Prevnar, a pneumococcal vaccine that has achieved multibillion-dollar revenues; Acel-Immune, and acellular pertussis vaccine; and Meningitec, a meningococcal meningitis vaccine. Prior to Wyeth, Dr. Siber was Director of the Massachusetts Public Health Biologic Laboratories and a Harvard Medical School Associate Professor of Medicine at Dana Farber Cancer Institute. Dr. Siber holds an MD degree from McGill University in Canada, received post-doctoral training in Internal Medicine at Rush-Presbyterian Hospital in Chicago and Beth Israel Hospital in Boston, and Infectious Disease and vaccinology training at Children’s Hospital and Beth Israel Hospital, Harvard Medical School Boston.