Joining the Department in 1991, Cook spent a number of years as a Patrol Officer, Field Training Officer, and later Juvenile Crimes Detective. At the rank of Lieutenant, he would be reassigned to the Mission Row Patrol Division, and later to shift leader following the departure of the lieutenant formerly holding the title, where he would conduct a number of changes to Community Affairs, and work closely with the District Attorney's Office to modernize the investigation of internal criminal investigations and Use of Force. After the departure of the then Assistant Chief, Cook took the reins as Assistant Chief of Police and Director of Operations. After Chief Corbin stepped down to Deputy Chief, William Cook took over the department as Chief of Police.
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