Elegant silent screen matinée idol, the son of a tax collector. In films from 1914, he appeared as romantic lovers and bon vivants opposite most of the major female stars of the period. He set up his own production company in 1922. His career was disrupted by a motorcycle accident in 1924, as a result of which he suffered severe injuries from which he never fully recovered. Having failed to make the transition to sound Kastner committed suicide by hanging himself in 1930.