Career
He joined the Metropolitan Police in 1965 as a police constable, working first in south-east London before moving to the Community Relations Branch at New Scotland Yard and the Traffic Division, then moving to Kent Police and then the West Midlands Police. He was knighted in the 2001 New Year Honours. In 2011-2012, Crewe provided advice and research support to Tom Winsor during his Independent Review of Police Office and Staff Remuneration and Conditions.