Chief Thuilliez

CAREER

Sean Thuilliez was appointed Chief of the Tustin Police Department on March 18, 2025 after serving 18 years at the Beaumont Police Department and the last nine as their Chief.

Chief Thuilliez oversees all law enforcement services for the City of Tustin. He is a native Californian and grew up in the Inland Empire. Chief Thuilliez is a graduate of the University of Redlands, obtaining his master’s degree in management. He is a graduate of the FBI National Academy class 245 and the California POST Command College class 55.

Chief Thuilliez began his public service as a Police Explorer and later as a Reserve Police Officer with the Redlands Police Department. He was then sworn in as a Police Officer with the Redlands Police Department in May of 1999. His assignments there included Patrol, FTO, Narcotics and Vice Detective, SMASH- Gang unit, Special Response Team and later Corporal.

Chief Thuilliez lateraled to the Beaumont Police Department in May of 2007 to train and mentor the many new officers hired during Beaumont’s rapid population expansion. He worked in Patrol and then community policing where he established the department’s Quality of Life Team. Chief Thuilliez has worked command assignments as both a lieutenant and commander and oversaw Patrol, Internal Affairs, Community Policing, and Investigations.

Chief Thuilliez is currently the 1st Vice President of the California Police Chiefs Association and will ascend to President in March of 2026.