Question: Which American film director won an Oscar for Best Picture, Stuart Rosenberg or Irwin Winkler?

Context paragraphs:
Margo Winkler: Margo Winkler (born c. 1935) is an American actress, who often played minor roles as receptionists, clerks or judges.  She is known for her minor roles in several of Martin Scorsese's films which her husband Irwin Winkler produced.  She is best known for her roles in "Goodfellas" (1990) as Belle Kessler and as the receptionist in "The King of Comedy" (1983) whom Robert De Niro's character approaches on numerous occasions.  She is also known for her role as Barbara in "Life as a House" (2001).  She made her screen debut in 1970 in Stuart Hagmann's "The Strawberry Statement".  In 1999 she appeared in her son Charles Winkler's picture "Rocky Marciano", and her last appearance was in 2006 in her husband Irwin Winkler's "Home of the Brave" as a waiting room mother.

Uncle Joe Shannon: Uncle Joe Shannon is a 1978 American drama film directed by Joseph Hanwright and written by Burt Young, who also stars.  The film was produced by Robert Chartoff and Irwin Winkler and distributed by United Artists.

Night and the City (1992 film): Night and the City is a 1992 American crime drama film and a remake of the 1950 film noir of the same name, itself an adaptation of Gerald Kersh's 1938 novel.  The film stars Robert De Niro and Jessica Lange and is directed by Irwin Winkler from a script by Richard Price.

Charles Winkler: Charles Winkler is an American television and film director and producer.  He is the son of Academy Award-winning producer and director Irwin Winkler and actress Margo Winkler and the husband of Sandra Nelson.

Raging Bull: Raging Bull is a 1980 American biographical black-and-white sports drama film directed by Martin Scorsese, produced by Robert Chartoff and Irwin Winkler and adapted by Paul Schrader and Mardik Martin from Jake LaMotta's memoir "".  It stars Robert De Niro as Jake LaMotta, an Italian American middleweight boxer whose self-destructive and obsessive rage, sexual jealousy, and animalistic appetite destroyed his relationship with his wife and family.  Also featured in the film are Joe Pesci as Joey, LaMotta's well-intentioned brother and manager who tries to help Jake battle his inner demons, and Cathy Moriarty as his wife.  The film features supporting roles from Nicholas Colasanto, Theresa Saldana, and Frank Vincent.

Irwin Winkler: Irwin Winkler (born May 25, 1931) is an American film producer and director.  He is the producer or director of 50 motion pictures, dating back to 1967's "Double Trouble", starring Elvis Presley.  The fourth film he produced, "They Shoot Horses, Don't They? " (1969), starring Jane Fonda, was nominated for nine Academy Awards.  He won an Oscar for Best Picture for 1976's "Rocky".  As a producer, he has been nominated for Best Picture for three other films: "Raging Bull", "The Right Stuff", and "Goodfellas".

Believe in Me (1971 film): Believe in Me is a 1971 American romantic drama film directed by Stuart Hagmann and written by Israel Horovitz.  The film was produced by Robert Chartoff and Irwin Winkler.

Sam O'Steen: Samuel Alexander "Sam" O'Steen (November 6, 1923 – October 11, 2000) was an American film editor and director.  He had an extended, notable collaboration with the director Mike Nichols, with whom he edited twelve films between 1966 and 1994.  Among the notable films that O'Steen edited were "Who's Afraid of Virginia Woolf" (directed by Mike Nichols, 1966), "Cool Hand Luke" (directed by Stuart Rosenberg, 1967), "The Graduate" (directed by Mike Nichols, 1967), "Rosemary's Baby" (directed by Roman Polanski, 1968), and "Chinatown" (directed by Roman Polanski, 1974).  On a 2012 listing of the 75 best edited films of all time, compiled by the Motion Picture Editors Guild based on a survey of its members, both "The Graduate" and "Chinatown" appear.

At First Sight (1999 film): At First Sight is a 1999 American romantic drama film starring Val Kilmer and Mira Sorvino, based on the essay "To See and Not See" in neurologist Oliver Sacks' book "An Anthropologist on Mars" and inspired by the true life story of Shirl Jennings.  The film was directed by Irwin Winkler and written by Steve Levitt.

Stuart Rosenberg: Stuart Rosenberg (August 11, 1927 – March 15, 2007) was an American film and television director whose motion pictures include "Cool Hand Luke" (1967), "Voyage of the Damned" (1976), "The Amityville Horror" (1979), and "The Pope of Greenwich Village" (1984).  He was noted for his work with actor Paul Newman.

Supporting paragraphs: Irwin Winkler Stuart Rosenberg
Answer: Irwin Winkler