Thomas Lemmer Thomas Lemmer is a former deputy chief of the Chicago Police Department (CPD), with two decades of experience directing, managing, and assessing other law enforcement supervisors and executives. As deputy chief, he led CPD’s management accountability processes, and authored the agency’s formal CompStat directive. He also oversaw CPD’s fusion center and the standards compliance of the city’s district-level Strategic Decision Support Centers.

In prior roles, he served as CPD’s gang violence project coordinator, led the department’s policy development efforts, and was an inspector reviewing police operations across the city. He was also a gang tactical officer, sergeant, lieutenant, captain, district executive officer, and commander. He has expertise in addressing the complexities of community policing, gangs, violence, juvenile crime, patrol operations, police policy development, supervisory engagement, and management accountability. Overall, he has forty years of experience in the public safety profession, including as a federal law enforcement officer, an adjunct instructor for Loyola University Chicago, and now as a law enforcement trainer and consultant.