Brian Horace Clemens OBE was an English screenwriter and television producer. He worked on the British TV series The Avengers and created The New Avengers and The Professionals.
He wrote for ITC Entertainment's thriller series The Invisible Man (ITV, 1958–1959), Sir Francis Drake (ITV, 1961–1962), and Danger Man (ITV, 1960–1961; 1964–1967; also known as Secret Agent), for which he had written the pilot.[2] His output was so prolific during the late 1950s and throughout the 1960s that he frequently used the pseudonym Tony O'Grady.
