Paul Eugen Bleuler (German: [ˈɔɪɡeːn ˈblɔɪlər]; 30 April 1857 – 15 July 1939)[1] was a Swiss psychiatrist and eugenicist[2] most notable for his contributions to the understanding of mental illness and for coining the terms "schizophrenia",[3][4] "schizoid",[5] "autism",[6] and what Sigmund Freud called "Bleuler's happily chosen term ambivalence".[7]