Milton William "Bill" Cooper (May 6, 1943 – November 6, 2001) was an American conspiracy theorist, radio broadcaster, and author best known for his 1991 book Behold a Pale Horse, in which he warned of multiple global conspiracies, some involving extraterrestrial aliens.[1][2][3] Cooper also described HIV/AIDS as a man-made disease used to target blacks, Hispanics, and homosexuals, and that a cure was made before it was implemented.[4] He has been described as a "militia theoretician".[5]