The Los Angeles County Chief Executive Office (LAC CEO) known as the Los Angeles County Chief Administrative Office (LAC CAO) from 1938 to 2007 assists the Board of Supervisors of Los Angeles County California with administrating the county. The chief executive officer (CEO) supervises 31 out of the 39 departments of the County and works closely with the remaining eight (which include the District Attorney Fire Department and Sheriff’s Department among others).