Biography in: John Wakeman, editor. "World Film Directors, Volume One, 1890-1945". Pages 325-330. New York: The H.W. Wilson Company, 1987.

I am only a craftsman working in a very big industry that in a third of a century conquered the markets, caught up the oldest and most important human activities like metallurgy or motor-engineering and may be compared with press for its social influence and its power in spreading ideas.