Which director's first film was "THX1138"?

"THX 1138" is a 1971 American science-fiction film set in a dystopian future in which the populace is controlled through android police and mandatory use of drugs that suppress emotions. It was directed by George Lucas in his feature film directorial debut in 1971. Produced by Francis Ford Coppola and written by Lucas and Walter Murch, it stars Donald Pleasence and Robert Duvall.

"THX 1138" was developed from Lucas's student film Electronic Labyrinth: "THX 1138 4EB", which he made in 1967 while attending the USC School of Cinematic Arts. The feature film was produced in a joint venture between Warner Bros. and American Zoetrope. A novelization by Ben Bova was published in 1971. The film received mixed reviews from critics and failed to find box-office success on initial release; however, the film has subsequently received critical acclaim and gained a cult following, particularly in the aftermath of Lucas's success with Star Wars in 1977.