The charges against Neisworth were later dismissed because there wasn't enough evidence to convict him. Repeated calls to him and Spanier for comment were not immediately returned. Penn State University officials declined to comment on McLaughlin's claims.
Neisworth has been nationally recognized for his work with autistic children, and even penned the acclaimed book, "The Autism Encyclopedia."
McLaughlin later sued the professor, but settled with him out of court for an undisclosed sum in March 2006. Neisworth denied all wrongdoing.
McLaughlin added that he did not pursue any further legal action with the professor or the university because the statute of limitations on the alleged crime had expired.
McLaughlin has now become an advocate for child abuse victims, and spoke on behalf of the National Center for Victims of Crime at a rally in front of the Pennsylvania state legislature Tuesday to demand action on bills that will strengthen the state's child sex abuse laws.
"They need to make it mandatory for any adult that knows that abuse is being committed against a child to report to law enforcement, not to an administration that is more interested in covering their financial assets than they are protecting children," he said.