Bob Lazar (born 26 January 1959) is a central (and highly controversial) figure in discussions about UFOs. Lazar claims to have worked at area S-4 of the Nevada Test Site (near Area 51) at the special request of Edward Teller. He further claims to have performed reverse engineering on crashed extraterrestrial spacecraft there. The publicity surrounding his revelations is one of the major factors in putting the previously obscure military facility in public awareness.
Despite the controversey surrounding him Bob was one of the first publically know figures to give a more in depth insight as to how Ufo's function.