From Longman Dictionary of Contemporary Englishfire chiefˈfire ˌchief noun [countable] BOSSOsomeone who is in charge of all the fire stations in a city or area
Examples from the Corpus
fire chief• Higuchi, a deputy fire chief for Los Angeles County since January 1994.• The bowling alley fire in a neighboring town that killed five firemen when my father was deputy fire chief.• Brown swore in his new fire chief, Bob Demmons, during a ceremony Tuesday morning.• No one the fire chief was. 