John B. Alexander is a retired United States Army colonel. An infantry officer for much of his career, he is best known as a leading advocate for the development of non-lethal weapons and of military applications of the paranormal. He has written and lectured on UFOs. He characterizes his career as having "evolved from hard-core mercenary to thanatologist". Alexander figures prominently in journalist Jon Ronson's book 'The Men Who Stare At Goats', which was adapted into a Hollywood film starring George Clooney (2009).