Thomas Hagen is a fictional character in Mario Puzo's 1969 novel The Godfather and Francis Ford Coppola's films The Godfather (1972) and The Godfather Part II (1974). He is portrayed by Robert Duvall in the films. He also appears in the Mark Winegardner sequel novels The Godfather Returns and The Godfather's Revenge, as well as Ed Falco's novel The Family Corleone. Duvall was nominated for an Academy Award for Best Supporting Actor and a BAFTA for his performance in the first film. He operates as the consigliere and as a lawyer for the Corleone family, and is an informally adopted member of the family. Source: Wikipedia (en)