Question: Jörg Buttgereit and Mike Cahill, have which mutual occupations?

Context paragraphs:
I Origins: I Origins is a 2014 American science fiction drama film written and directed by Mike Cahill.  The independent production premiered at the 2014 Sundance Film Festival on January 18 , 2014.  It is distributed by Fox Searchlight Pictures, and opened in limited release on July 18 , 2014.  It won the Best Feature Length Film Award at the Festival Internacional de Cinema Fantàstic de Catalunya on October 11, 2014.

Nekronology: Nekronology is an album by the German avant-garde/experimental musician Hermann Kopp.  It was released in October 2004 as a CD and in July 2009 as a vinyl LP, with a different artwork.  The album is a compilation of Kopp’s soundtracks to the German films Nekromantik, Der Todesking and Nekromantik 2 by the film director Jörg Buttgereit, completed by two bonus tracks.

1979 Tel Aviv Open – Doubles: Ilie Năstase and Tom Okker won the title, defeating Mike Cahill and Colin Dibley 7–5, 6–4 in the final.

Mike Cahill (director): Mike Cahill (born July 5, 1979) is an American film director and screenwriter.

Schramm (film): Schramm is a 1993 German horror film directed by controversial taboo-breaking auteur Jörg Buttgereit.  It is stylised and artfully shot on 16mm film.  It tells the story of a man who has been known in the media as the 'Lipstick Killer'.  Loosely based on true crime criminology profiles of Carl Panzram and similar serial killers.

Nekromantik 2: Nekromantik 2: Die Rückkehr der Liebenden Toten (The Return of the Loving Dead) (stylized as "NEKRomantik 2") is a 1991 German horror film directed by Jörg Buttgereit and a sequel to his 1987 film "Nekromantik".  The film is about necrophilia, and was quite controversial and was seized by authorities in Munich 12 days after its release, an action that had no precedent in Germany since the Nazi era.

Jörg Buttgereit: Jörg Buttgereit (born 20 December 1963) is a German writer/director known for his controversial films.  He was born in Berlin, Germany and has lived there his entire life.

King of California: King of California is a 2007 American comedy-drama film written and directed by Mike Cahill.  It is his debut as a screenwriter and director.  The film premiered on January 24, 2007 at the 2007 Sundance Film Festival and opened in limited release in North America on September 14, 2007.  The film stars Michael Douglas as a mentally ill man who believes he has discovered buried treasure and Evan Rachel Wood as his weary daughter.

Nekromantik: Nekromantik (stylized as NEKRomantik) is a 1987 West German horror exploitation film co-written and directed by Jörg Buttgereit.  It is known to be frequently controversial, banned in a number of countries, and has become a cult film over the years due to its transgressive subject matter (including necrophilia) and audacious imagery.

Der Todesking: Der Todesking (aka "The Death King") is a 1989 German horror film directed by Jörg Buttgereit.  This experimental style movie, which does not use central characters, explores the topic of suicide and violent death in the form of seven episodes, each one attributed to one day of the week.  These episodes are enframed by the vision of a human body, slowly rotting during the course of the movie.

Supporting paragraphs: Jörg Buttgereit Mike Cahill (director)
Answer: film director and screenwriter