Question: What film star of the 2016 American crime-drama film directed by Ewan McGregor was best known for his role in "Animal House?"

Related documents: [0]  [DOC] American Pastoral is a 2016 American crime-drama film directed by Ewan McGregor and written by John Romano, based on the 1997 novel of the same name by Philip Roth. The film stars McGregor, Jennifer Connelly, Dakota Fanning, Peter Riegert, Rupert Evans, Uzo Aduba, Molly Parker and David Strathairn. Principal photography began on September 21, 2015, in Pittsburgh. [END] 
[1]  [DOC] Peter Riegert (born April 11, 1947) is an American actor, screenwriter and film director, best known for his roles as Donald "Boon" Schoenstein in "Animal House" (1978), "Mac" MacIntyre in "Local Hero" (1983), fast-talking gangster Aldo in "Oscar" (1991), tough, no-nonsense Lt. Kellaway in "The Mask" (1994), newspaper editor Delbert McGinty in "We Bought a Zoo" (2011) and glove manufacturer Lou Levov in "American Pastoral" (2016). He directed the short film "By Courier" (2000) and, along with producer Ericka Frederick, was nominated for the Academy Award for Best Live Action Short Film. [END]  
Answer: Peter Riegert
Peter Riegert