Police say there could be more than 100 victims, many whom they're trying to identify.
Court documents show the man worked for Paradise Valley Community College, but it is unclear in what capacity.
He was also a member of the Maricopa County Sheriff's Posse for two years until March when they learned of this investigation.
Police say the man had no intentions of finding modeling jobs for these girls. Investigators say it appears his only intentions were to try and get revealing photos and video of the girls or perform sex acts with them.
Jarre Bjelic faced a judge Friday, who read him the 20 counts he's facing, ranging from sexual conduct to extortion and luring a minor.
Investigators say the 20-year-old was contacting girls on Instagram, asking for nude photos, saying he was with Belle Vertu modeling or Maintain Focus Modeling.
According to court documents, a 15-year-old girl sent him a topless photo, but when she declined to send him more nude photos he threatened to distribute the topless photo to her Scottsdale High School.
Court documents say he would also demand sex acts from girls, and in some cases create Instagram profiles using their revealing photos.
In another instance, documents show a 19-year-old signed a contract with his modeling company, then incurred fines, and sent an invoice for 11,000 for failing to send new photos and videos.
Police believe Bjelic tried these schemes with around 100 different girls in the past two years. Investigators say they've identified 53 girls and are working to identify others.
But Bjelic's arrest record dates back to 2009 when he was 15-years-old.
Court documents show he was arrested in Scottsdale for threatening and harassing a girl and her mother via Facebook and text messaging. He allegedly told the girl she better be his girlfriend or he was going to destroy her life.
Bjelic covered his head after being arrested Thursday. Friday, the first thing he asked a judge, was when he could bond out of jail.
"Can I post bond today?" he said.
"If you can make arrangements, or have $10,000 yourself it's postable today," said the judge.
It appears Bjelic did post bond and is in the process of being released. A judge has ordered him to be electronically monitored by an ankle bracelet.
He is not allowed to contact victims or access the internet. His next court date is scheduled for May 7, 2015.