MELVILLE, N.Y. -- A 34-year-old Long Island man believed to have been employed at Camp Kenwal in Melville has been charged with multiple sex abuse and pornography charges involving children spanning over a decade.

Keith Meyn, of Oakdale, pleaded not guilty Monday in Suffolk County court to an indictment alleging he used an 11-year-old boy in sexual performances along with possessing a massive collection of child pornography featuring young boys less than 16 years of age.

Meyn, who is believed to have been employed at Camp Kenwal in Melville as a group leader, camp counselor and most recently as the Director of Maintenance Operations, appears to have participated in the illegal activity involving children for over a decade, Suffolk County District Attorney Thomas Spota said.

District Attorney Spota said Meyn was previously associated with a film company, Psych Ward films, and modeling agencies Camden Enterprises and StoneAge Enterprise.

“The defendant participated in disturbing photography and videography featuring young boys,” DA Spota said.

Authorities believe there are more victims and are asking them to come forward -- even if the crimes happened years ago.

Victims and others with knowledge helpful to the investigation should call the Suffolk County Police Department Computer Crimes Unit at (631) 852-6279. All calls are confidential.

Meyn has been charged with with three counts of criminal sexual act in the first degree, three counts of use of a child in a sexual performance as a sexually motivated felony, three counts of sexual abuse in the first degree, three counts of endangering the welfare of a child, and 100 counts of possessing a sexual performance by a child.

Bail was set for Meyn at $250,000 cash or $500,000 bond on the 112 count indictment.