Besides playing Al Capone, William also played another real life mobster, Sammy "the Bull" Gravano, in the 1996 TV movie Gotti.
William played notorious Chicago gangster Al Capone in the 1993-94 revival series of The Untouchables.
William has an extensive and noted career in theatre, on and off Broadway.
William is best known equally for playing bad guys as well as hard-nosed cops on television and in film.
William appeared as himself in the documentary The Revenge of the Dead Indians (1993).
William appeared in the documentary Dick Tracy: Behind the Badge, Behind the Scenes (1990).
William made his major motion picture debut in the film Long Shot (1980).
William was the Executive Producer for the film Paradise Lost (1999).
William was the Co-Producer of the film Big City Blues (1999).
William was the Executive Producer for the film Beyond Desire (1996).
William was the Producer for the film The Last Letter (2004).
William worked as a writer on the film The Librarians (2004).
William's first television appearance was in the TV-movie The Miracle of Kathy Miller.
William's breakthrough appearance was in the film Once Upon a Time in America (1984).
William's birthday falls under the Year of the Ram.
In 1993, William was nominated Independent Spirit Award for Best Supporting Male for: The Waterdance (1992).
William's first acting appearance was in the title role of Julius Ceasar at a school production.
William was in the alternate ending for Scary Movie 3 (2003) as Cindy's psychiatrist, but was left on the cutting room floor. (The scene is featured on the DVD.)