Mark retired after 27 years as a Special Agent with the Federal Bureau of Investigation where he spent most of his career conducting violent crime investigations. Mark held positions such as Crisis Management Coordinator, Violent Gang Safe Streets Task Force Coordinator, and team leader for the FBI’s Southeast Region Child Abduction Rapid Deployment Team. For the last 7 years of his career, he was assigned to the Behavioral Analysis Unit (BAU) where he was responsible for providing behaviorally based operational support to law enforcement involved in the investigation of violent crimes and threats. Mark co-authored Crimes Against Children: Behavioral and Investigative Perspectives and the third edition of the FBI’s Child Abduction Response Plan.

For the past four years Tom has been an instructor for NCJTC in various class including Child Homicide, Cold Case Homicide and Major Case Investigations. Mr. Biesty was an accomplished and well-respected attorney and leader in the Cook County State’s Attorney’s Office with a 26 year record of prosecutorial excellence. He has an extensive trial experience across a wide spectrum of cases including many first-time prosecutions for the State of Illinois. For 15 years Tom was a Supervisor in Cook County State’s Attorney’s Office in Chicago, IL. Some of his responsibilities include, but are not limited to, coordinating investigations among various law enforcement agencies and applying new methods and science to solve cold case crimes. Tom has been the recipient of numerous awards in 2015 and 2013 the Award of Excellence from the Illinois Homicide Investigators Association.