Chief Bill McMahan joined the PISD PD as a Dispatcher in January 2002. He received his Basic Certification in Law Enforcement from Houston Community College. He joined the P.I.S.D. P.D on July 16, 2003. Bill was selected as the 2009 Officer of the Year. Bill is a certified Hostage/Crisis Negotiator for the department's Crisis Negotiations Team and a graduate of the FBI-LEEDA Trilogy program. Bill holds a Masters Peace Officer License, is TCOLE Instructor, has served as a Field Training Officer, Firearms Instructor and Defensive Tactics Instructor for the department. Effective August 22, 2011, Bill was assigned to the position of Detective. Bill was promoted to Sergeant on May 29, 2012, and assigned to Patrol. June 01, 2015 Bill was promoted to Administrative Captain where he would oversee, Administrative Services, Policy Management, Telecommunications, and Training. February 27, 2024 Bill was appointed to the position of Chief of Police.