Joseph Nicolosi, American clinical psychologist (died 2017)

Joseph Nicolosi was an American clinical psychologist who advocated and practised "reparative therapy", a form of the pseudoscientific treatment of conversion therapy that he claimed could help people overcome or mitigate their homosexual desires and replace them with heterosexual ones. Nicolosi was a founder and president of the National Association for Research and Therapy of Homosexuality (NARTH).