Rub's parents, Otto and Paula, were an actor and a "stage beauty", respectively.

Two years later, he was in the Tyrolean Alps with a company, "playing everything from very ancient grandpas to very young lovers.

[citation needed] He ventured into drama on stage with a role in a production of Grand Hotel in Los Angeles in the early 1930s.

He replaced the first actor, whose voice Walt Disney considered to be too harsh.

[5] During the creation of Pinocchio, Rub was notorious amongst the film's animators for his open and frequent expression of admiration for Adolf Hitler.