He spent the early years of his career working in an outpatient dual diagnosis clinic. His interest with sexual disorders began with his dissertation topic studying the relationship between sexual and aggressive arousal. After brief teaching interlude, he began assessing and treating individuals with a wide variety of paraphilias and Paraphilic Disorders. He has evaluated hundreds of individuals and testified in State and Federal Courts on numerous occasions. He has developed a special interest with Internet child pornography offenders spanning twenty years.