Brian Horace Clemens OBE ( 30 July 1931 -- 10 January 2015 ) was an English screenwriter and television producer , possibly best known for his work on `` The Avengers '' and `` The Professionals '' .
Brian Horace Clemens OBE ( 30 July 1931 -- 10 January 2015 ) was an English screenwriter and television producer . He was best known for his work on the television shows `` The Avengers '' and `` The Professionals '' .