Lt. Colonel Doyle began his career with the St. Louis County Police on April 27, 1992, when he was hired as a Probationary Police Officer and assigned to the South County Precinct. As a member of the St. Louis County Police Department, he has served in the following capacities:
- Officer - South County Precinct, North County Precinct and Community Action Team
- Detective - Bureau of Drug Enforcement, FBI Gang Task Force, Intelligence Unit and FBI Public Corruption Task Force
- Sergeant - North County Precinct and the Neighborhood Policing Unit
- Lieutenant - North County Precinct and South County Precinct
- Lieutenant - Interim Police Chief and then Commander: City of Jennings Detail
- Captain - Commander of the North County Precinct and then Commander of the Division of Criminal Investigation
Lt. Colonel Doyle was promoted to his current rank and assigned to his current position as Commanding Officer of the Division of Patrol in September 2014.
Lt. Colonel Doyle is an avid supporter of police and community relations, and is currently involved in numerous neighborhood watch and community relation programs. He received his Criminal Justice education from Lindenwood University. Lt. Colonel Doyle has also attended countless hours of training in a variety of law enforcement, leadership and management related areas. He is a graduate of the 245th session of the FBI National Academy. Lt. Colonel Doyle is the recipient of numerous letters of appreciation, Awards of Excellence, and Chief's Commendations.
Along with being a passionate Dallas Cowboys fan, Lt. Colonel Doyle's hobbies include: motorcycling, traveling, fishing, and spending time with his family.
Little known Fact: Outside of his compassionate personality, Lt. Colonel Doyle is a very private individual who enjoys his personal time.