While Primus is primarily an actor, he has also worked as a writer and director in films in which he has acted. For the first decade of his career, he was employed as a stage actor. He gained some experience on TV in shows like The Defenders, East Side/West Side and The Virginian.
After working as second unit director on Mark Rydell's The Rose (1979), Primus increased his behind-the-camera activities; in 1992, he directed his first theatrical feature, the "inside" Hollywood comedy/drama Mistress.