Joseph Nicolosi

Joseph Nicolosi (born January 21, 1947) is a clinical psychologist, founder and director of the Thomas Aquinas Psychological Clinic, in Encino, California, and the president of the National Association for Research and Therapy of Homosexuality (NARTH). Nicolosi has studied, advocated, and practiced reparative therapy, which attempts to change the sexual orientation of homosexuals and bisexuals to heterosexual. Nicolosi holds a Ph.D. from the California School of Professional Psychology.


Joseph Nicolosi says that he has concluded on the basis of his study and professional experience that homosexuality is the product of a mental disorder he describes as "gender-identity deficit" caused by an alienation from, and perceived rejection by, individuals of the subject's gender.

''"The basic premise of reparative therapy is that the majority of clients (approximately 90%, in my experience) suffer from a syndrome of male

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