Tommy Brooks began his career in law enforcement after his honorable discharge from the United States Marine Corps (non-combat) in 1998. He started as a Transit cop and then became a member of the Boston Police Department. After working primarily in plain clothes units, Brooks joined the Boston Gang Unit as a detective and later, as a Sergeant. While in the gang unit, he worked making gang cases via informants, undercover work, search warrants, and other investigative means. He has also maintained a working role as an Academy Instructor for many academies throughout Massachusetts.

During his career, he has had the opportunity to work with the best cops in the nation, and he has received the George L Hanna Award for Bravery from the Governor of Massachusetts, two Medals of Honor, and a Medal of Valor, and an Award of Merit from the Governor. He currently holds the rank of Lieutenant in the Boston Police Department.