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Welcome to IATSO

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International Association for the Treatment of Sexual Offenders (IATSO)




Dear colleagues – we are saddened to note the passing of Dr Grant Harris who died unexpectedly in early October of a stroke. Grant was one of the keynote speakers at the IATSO conference in Porto, and was a prominent risk assessment researcher and a wonderful person. He will be missed!



IATSO was founded formally on March 24th, 1998 in Caracas, Venezuela during the 5th International Conference on the Treatment of Sex Offenders. It is an international non-profit organization committed to the promotion of research of and treatment for sexual offenders throughout the world. 

Goals and Objectives