Aaron is the unit chief and Supervisory Special Agent of Quantico's Behavioral Analysis Unit (BAU). Focused on leading the team, he does things by the book and is rarely upset by cases, consistently keeping his cool and refusing to be provoked. Aaron has a bone-dry sense of humor, which he keeps hidden except with family. He has a son, Jack Hotchner, from his marriage to his late wife, Haley Brooks. Aaron is a Caucasian man with wavy black hair and brown eyes.