Question: Which filmmaker is not German, David Gordon Green or Detlev Buck?

Context paragraphs:
Detlev Buck: Detlev Buck (born December 1, 1962 in Bad Segeberg) is a German film director, actor, producer and screenwriter.

Dan Hewitt Owens: Dan Hewitt Owens (born July 5, 1947) is an American actor.  He has had a film and TV career spanning five decades mostly in supporting roles.  He has worked with many renowned directors, including David O. Russell, David Gordon Green, Jon Turteltaub, Felix Enriquez Alcala and Gilles Paquet-Brenner.

Tough Enough (2006 film): Tough Enough (German title: Knallhart) is a German film directed by Detlev Buck, based on the novel Knallhart by Gregor Tessnow and released in 2006.  Main actors are David Kross and Jenny Elvers.  The screenplay is written by Gregor Tessnow and Zoran Drvenkar.

George Washington (film): George Washington is a 2000 American drama film written and directed by David Gordon Green.  Its story centers on a group of children in a depressed small town in North Carolina who band together to cover up a tragic mistake.

No More Mr. Nice Guy (film): No More Mr. Nice Guy (German: Wir können auch anders … ) is a 1993 German comedy film directed by Detlev Buck.  It was entered into the 43rd Berlin International Film Festival where it won an Honourable Mention.

Manglehorn: Manglehorn is a 2014 American drama film directed by David Gordon Green and written by Paul Logan.  The film stars Al Pacino, Holly Hunter, Harmony Korine and Chris Messina.  It was selected to compete for the Golden Lion at the 71st Venice International Film Festival.  The film was released in theaters on June 19, 2015, by IFC Films.

David Gordon Green: David Gordon Green (born April 9, 1975) is an American filmmaker.  He has directed dramas such as "George Washington", "All the Real Girls", and "Snow Angels", as well as the thriller "Undertow", all of which he wrote or co-wrote.  In 2008, he transitioned into comedy, directing the films "Pineapple Express" and "Your Highness", as well as episodes of the HBO comedy "Eastbound & Down".  In 2013, he returned to his more dramatic roots with the independent film "Prince Avalanche".  Since then, he has worked between the two genres, directing the films "Joe", "Manglehorn" and "Our Brand Is Crisis", and episodes of the television comedy-drama "Red Oaks", which he also executive produces.

Same Same but Different: Same Same but Different is a 2009 German film, a love story starring David Kross and Apinya Sakuljaroensuk.  It was directed by Detlev Buck.  The script follows the Benjamin Prüfer's 2006 autobiographical magazine article, later published as a novel in 2007.

Männerpension: Männerpension ("Jailbirds" in English) is a 1996 German comedy film directed by Detlev Buck.

Either Way (film): Either Way (Icelandic: Á annan veg ) is a 2011 Icelandic comedy film directed by Hafsteinn Gunnar Sigurðsson.  Writer-director David Gordon Green and Dogfish Pictures remade "Either Way" in 2013 as "Prince Avalanche".

Supporting paragraphs: David Gordon Green Detlev Buck
Answer: David Gordon Green