Career
Best known for his work on the 1960s spy drama The Avengers with Brian Clemens, Fennell also produced (with Clemens) its follow-up, The New Avengers and The Professionals. The Professionals was made by Mark One Productions and The New Avengers by The Avengers (Film and television) Enterprises Limited, both companies Fennell established with Clemens and composer Laurie Johnson. Fennell"s film career had started as a production designer and writer
His later film productions included And Soon the Darkness (1970) and Captain Kronos – Vampire Hunter (1973).