He debuted as a revue performer at Mosebacke in 1929 and was then active at various outdoor theaters in Stockholm.
He was engaged by Folkan's theater director Ragnar Klange.
Bernheim was considered a skilled imitator and worked in 20 different films.
He imitated Karl Gerhard, among others.
Bernheim was married to the Norwegian singer Jeanita Melin (1911-1973) before marrying Mary Viktoria Lindström (1924-1979) in 1946.