 Three of the people appearing in this film were not actors but were,  in fact, individuals who each played significant roles in the recent  history of smallpox. Only one of these has his personal history  recounted in any great detail, Ken Alibek (qv) (formerly Kanatjan  Alibekov), who served as deputy director and chief scientist of the  Soviet Unions biological warfare program, BioPreparat, from 1987  until 1992, when he left Russia for his native Kazakhstan and  ultimately defected to the U.S. Of the other two, Christopher Davis  served as part of a team of U.S. and British inspectors that toured  the Soviet bioweapons lab at Koltsovo in January 1991. Questioning  of Soviet technicians by Davis and one of his British colleagues  gave the West their first real inkling (later confirmed after  Alibeks defection) that the Soviets were experimenting with live  smallpox virus. D.A. Henderson M.D. (qv) (full name, Donald  Ainslie Henderson) is correctly identified in the special as  director of the Office of Public Health Preparedness, a position he  took up at the time of the offices creation in November 2001. From  1966 through 1977, he led the World Health Organizations campaign  to eradicate smallpox worldwide. For this, he deserves more credit  than perhaps anyone else alive for eliminating smallpox as an  endemic disease.