Sean Mannix is a seasoned law enforcement professional with a distinguished 36-year career in public safety. He held several key leadership positions throughout his career, including Assistant Chief of Police in Austin and Cedar Park, Texas. He focused on refining policing strategies, advancing training programs, and strengthening community ties. After retiring in 2020, he contributed to public safety by serving as the Statewide Traffic Incident Management Coordinator for the Texas Department of Transportation.

Born and raised in California, Sean was one of five children. His father, a law enforcement officer, inspired him to pursue a career in policing from an early age. At 18, he joined the U.S. Marine Corps Reserve, developing leadership skills and a strong work ethic that would later serve him in his law enforcement career.

Sean earned his Bachelor of Science in Criminal Justice from Excelsior College, graduating with honors. He went on to earn a Master of Arts in Homeland Security from American Military University. Additionally, he is a graduate of the FBI National Academy, the Leadership Command College, the Senior Management Institute for Police, and the LAPD West Point Leadership Program.

After completing his service in the Marine Corps, Sean returned to Alameda, California, where he began his law enforcement career at the Alameda Police Department at the age of 20. Over the next few years, he honed his skills in various patrol duties and emergency response.

In 1993, he moved to Austin, Texas, where he joined the Austin Police Department and spent the next two decades advancing. As Assistant Chief, Sean was involved in critical initiatives like reducing crime through the COMPSTAT model, improving community outreach, and developing partnerships with federal agencies such as the FBI and DEA. He also served in various divisions, including Organized Crime and Central Bureau, focused on crime prevention and public safety.

In 2013, Sean took on a new role as Chief of Police for the Cedar Park Police Department. During his tenure, he worked to enhance officer training, prioritizing community policing and positive relationships with the community. He also introduced groundbreaking programs like de-escalation training and body-worn cameras, significantly improving the department’s culture and reputation.

Upon retiring in 2020, he remained active in the law enforcement community. He continues his work with Sigma Tactical Wellness, focusing on the health and well-being of first responders, and supports Williamson County Crime Stoppers.

Outside of his career, Retired Chief Sean Mannix is a devoted family man. He is married to Eileen and has four daughters. He enjoys aviation, fishing, and outdoor activities, which help him unwind. He also values continuous learning and reads extensively for professional growth and personal enjoyment.