Which of the two people who wrote the screenplay for "Dead & Buried" a 1981 science fiction horror film, also worked as a director, visual effects supervisor, and occasional actor?
Dead &amp; Buried: Dead & Buried is a 1981 science fiction horror film directed by Gary Sherman, starring Melody Anderson, Jack Albertson, and James Farentino. Dead &amp; Buried:  The film focuses on a small town wherein a few tourists are murdered, but their corpses begin to reanimate. Dead &amp; Buried:  With a screenplay written by Dan O'Bannon and Ronald Shusett, the movie was initially banned as a "video nasty" in the UK in the early 1980s, but was later acquitted of obscenity charges and removed from the Director of Public Prosecutions' list. Dan O'Bannon: Daniel Thomas "Dan" O'Bannon (September 30, 1946 – December 17, 2009) was an American film screenwriter, director, visual effects supervisor, and occasional actor, usually in the science fiction and horror genres.
Dan O'Bannon