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Joseph Nicolosi (January 24, 1947 – March 8, 2017) was an American clinical psychologist, founder and director of the Thomas Aquinas Psychological Clinic in Encino, California, and a founder and president of the National Association for Research and Therapy of Homosexuality (NARTH). Nicolosi advocated and practiced reparative therapy, a practice that he claimed could help people overcome or mitigate their homosexual desires and replace them with heterosexual ones.

Nicolosi described his theories in Reparative Therapy of Male Homosexuality: A New Clinical Approach and three other books. Nicolosi proposed that homosexuality is often the product of a condition he described as gender-identity deficit caused by an alienation from, and perceived rejection by, individuals of the subject's gender. He held a Ph.D. from the California School of Professional Psychology. Nicolosi was a founding member of the National Association for Research & Therapy of Homosexuality (NARTH) and was its president for some time. NARTH is a professional association that promotes the acceptance of conversion therapy. He was an advisor to, and officer of, NARTH.

In 2012, California passed a law that banned the provision of conversion therapy to minors, including some of Nicolosi's existing patients. Nicolosi was named as a plaintiff in a lawsuit challenging the law on constitutional grounds but the law, effectively barring Nicolosi's clinic from taking on patients under the age of 18, was subsequently upheld.

In 2015, a New Jersey judge barred Nicolosi from appearing as an expert witness in a lawsuit filed against another provider of conversion therapy, Jews Offering New Alternative for Healing (JONAH). The court excluded all of JONAH's experts, including Nicolosi, because each expert "proffer[ed] the opinion that homosexuality either is a disorder or is not a normal variation of human sexuality," which contradicted "generally accepted scientific theory." He died in March 2017 at the age of 70 "from complications from the flu".

source: wikipedia