American film and television actor born in Mount Vernon, New York, is best known for Michael Clayton (2007), Caddyshack (1980) and Frozen River (2008) and The Great Santini.  O’Keefe was nominated for an Academy Award in 1981 for “Best Actor in a Supporting Role” for The Great Santini; nominated for the CableACE Award in 1987 for “Best Actor in a Dramatic Series” – The Hitchhiker; and nominated for a Golden Globe Award in 1981 for “New Male Star of the Year in a Motion Picture” – The Great Santini.  He plays Sam Tucker in Neighbors.