Collect 'em all!
Harry Blackstone Sr. aka The Great Blackstone (born Harry Bouton)
(Sep 27, 1885 - Nov 16, 1965)
Profession-changing contribution: The first (or at least best-known) multi-media star of magic. At the height of his career as a stage illusionist, Blackstone was also the star of a comic book, and the inspiration for the radio mystery-drama Blackstone, the Magic Detective.
Fun fact: Blackstone usually performed without talking, while the theater orchestra or pipe organ played carefully selected tunes to accompany his illusions.