Stephen Stace was arraigned on Thursday following an investigation that began back in August.
Montgomery County District Attorney Risa Vetri Ferman said it began when investigators received a tip stating an email on Stace's home computer, allegedly with a 16-year-old from Spain, was sexual in nature and referenced shared photographs.
Police interviewed Stace at his home in Upper Dublin, police say, where they found pictures of the girl in 'various stages of nudity.'
The computer also had additional images of child porn depicting other minors as well as several nude pictures of Stace, investigators said.
On September 16th, police say they again interviewed Stace where he allegedly admitted to sharing nude photos with the girl.
He also allegedly told them he communicated with the girl from his office before he retired from Penn State Abington.
Stace also allegedly admitted to taking nude photos of himself inside that office before sending them to the girl.
Police say they searched his Penn State email account and found a series of email exchanges which were allegedly sexual in nature.
The emails also allegedly contained sexually graphic information, including Stace's request to meet the girl for sex.
Stace's bail was set at 10% of $75,000 and a preliminary hearing is scheduled for later this month.