Matthew "Matt" Simmons is a Supervisory Special Agent with the Behavioral Analysis Unit. He was previously attached to the FBI's International Response Team (IRT), which was featured in Criminal Minds: Beyond Borders. He and the rest of the IRT were introduced in the Criminal Minds Season Ten episode "Beyond Borders". He reappeared as a main character in Season Thirteen when he joins the BAU following the disbandment of the IRT. Simmons was born in Carson City, Michigan to a White father and…