Thanks, all.
Charles, I did write about Freund's I Love Lucy work at the end of the story. He got involved in the series because Desi Arnaz was a personal fan of his work.
At Desilu, Freund invented the three camera system that was later used on DS and is still in use today.
Freund of course is best known as the cameraman on Fritz Lang's Metropolis (1926), Dracula (1931) and as the director of The Mummy (1932) and Mad Love (1935).