Who wrote "The Death of a President" (1967), about the Kennedy assassination?

In "Guess Who's Coming to Dinner" (1967), who played Dr. John Wade Prentice, the surprise dinner guest? In which 1967 film does Rod Steiger play Sheriff Gillespie opposite Sidney Poitier as Mr. Tibbs? In which 1967 film do Scott Wilson and Robert Blake play the drifters who murdered a Kansas family? Faye Dunaway and Warren Beatty played which Depression-era outlaw couple in 1967? In which 1967 film is a young man told "I just want to say one word to you... Plastics"? In which 1967 film does Sidney Poitier play a teacher who earns the respect of rough East End students? Which 1967 James Bond film starring Sean Connery is set largely in Japan? In which 1967 spy spoof does James Coburn battle a secret society of women plotting to take over the world?