Formally organized in 1859 with the appointment of John C. Willey as the first chief of police, the Cambridge Police Department was then manned by only 16 officers. The department has grown dramatically from its humble beginnings and today employs 277 sworn officers and a civilian staff of 37. Cambridge Police Department, the first comprehensive photographic history of the department, contains over 100 years of historical photographs, including images of specialized traffic and K-9 units, auxiliary police officers, uniforms, and equipment. Many of the vintage photographs in the collection have come from the department archives or were donated by family members of Cambridge officers.