Captain Wall joined the Department in 1981. As a police officer, he has worked patrol, Operations Central Bureau Major Crimes, Vice, and Training Division as a Field Training Officer during which time he was awarded the Police Medal. Additionally, Captain Wall served as an instructor in the Crisis Intervention Unit, where he was awarded the Police Meritorious Unit Citation for his part in developing the Department’s Human Relations Program. In 1989, he was promoted to Detective where he was assigned to Narcotics Group, Southwest Detectives, and the Office of the Chief of Police, Inspection and Control Section.

In 1991, he was promoted to Sergeant where he worked Rampart Patrol, and Pacific Division’s Beach Detail, where he was awarded his second Police Medal. He continued to work as a sergeant assigned as an Assistant Watch Commander, Employee Relations Investigator, and Internal Affairs. Upon his promotion to Lieutenant in 2001, he was assigned to Pacific Division as a Watch Commander. In 2002, Capt. Wall was awarded a Fulbright Fellowship and spent six months studying law enforcement ethics in England at the National Police Staff College, Bramshill. While attending Bramshill, Captain Wall also completed the Family Liaison Course and the International Commanders’ Programme. In 2003, Captain Wall was assigned as the Project Manager for the Department’s Mental Illness Project, tasked with identifying, developing, and implementing "best practices" for law enforcement responses to persons suffering from mental illnesses.

Captain Wall has a Bachelors Degree in History from the California State University Long Beach where he is currently completing his Masters Degree in History.