[Hillarys Gate Cult]

Writing Credits:

Terry Southern ... (screenplay) &
Joseph McGrath ... (screenplay)

Terry Southern ... (novel)

Graham Chapman ... (additional material) &
John Cleese ... (additional material) &
Peter Sellers ... (additional material)

[miss marmelstein]

There we go - Graham Chapman & Cleese. Southern wrote the novel, of course, as well as the screenplay. The movie has people doing anything for money - very funny.