Baltimore man who conspired with former Cambridge teacher pleads guilty to sexually exploiting, trafficking minors

A Filipino national residing in Baltimore, Maryland pleaded guilty in Boston federal court on Wednesday to sexually exploiting and conspiring to sex traffic minors with a former teacher at a private school in Cambridge, prosecutors said. 

Christopher Allan Tisoy, 27, pleaded guilty to one count of sexual exploitation of children and one count of conspiracy to commit sex trafficking of children, the U.S. Attorney’s Office for the District of Massachusetts said in a press release.

Tisoy, along with Joshua DeWitte, 50, were arrested and charged in May and indicted in October. Both remain in federal custody, officials said. 

In December 2024, DeWitte, a former music teacher at Buckingham Browne & Nichols School in Cambridge, allegedly uploaded child sexual abuse material showing the abuse of a young boy on his Snapchat account, prosecutors said. 

Snapchat records allegedly show that DeWitte requested nude photos from multiple minors, sent sexually explicit photos to minors, and offered to pay another Snapchat user to obtain and produce child pornography, officials said.

In conversations on Telegram, an encrypted messaging app, DeWitte and Tisoy allegedly discussed the “production of videos depicting the sexual exploitation of minor boys in the Philippines,” the press release said.

DeWitte allegedly paid Tisoy for each video Tisoy produced and sent, allegedly paying nearly $24,000, prosecutors said. 

Both DeWitte’s and Tisoy’s attorneys did not immediately respond to a request for comment. 

DeWitte’s next court date is scheduled for Jan. 21, 2026, court records show.  

DeWitte worked in the Cambridge public schools system for 13 years, Boston.com previously reported. 

Tisoy is scheduled to be sentenced May 6, 2026, officials said. 

Tisoy, a citizen of the Philippines, lawfully entered the United States in September 2024 on a H-1B Visa, the U.S. Attorney’s office said in a May press release. He was employed as a medical technologist at the Sinai Hospital of Baltimore, according to officials. 

The case was prosecuted as part of Project Safe Childhood, an initiative launched in 2006 by the U.S. Justice Department.