After 10 years on Roseanne, Sisters" and other series, he became a mega-star on ER, which catapulted him into a movie career, resulting in an Oscar for best supporting actor in Syriana.No. 3: STEVEN SPIELBERG -- Granted he didn't do much his first year here, after his birth in 1946, but you can not argue with the trend-setting shows he made once he got to Hollywood: E.T., Jaws, Raiders o