Chief Fong was assigned to the Special Operations Division in August 1998 when she was promoted to commander. While there, she was responsible for the Traffic, Tactical, and MUNI Transit companies. In June 2000, upon promotion to deputy chief, she was assigned to the Field Operations Bureau, where she managed the uniformed patrol personnel of the San Francisco Police Department. In August 2002, she was assigned to oversee the Administration Bureau. In May 2003, she was appointed assistant chief of police. Mayor Gavin Newsom appointed her acting chief of police on January 22, 2004, and chief of police on April 14, 2004.