Possible Clues:

• Noted Hollywood liberal since the 1960s
• 'The Aviator' Oscar nominee
• He's had 30+ Emmy nominations
• Winner of acting, writing and directing Emmys from a single series
• 'The West Wing' actor who played Arnold Vinick
• Writer-director of "A New Life"
• He was Hawkeye Pierce
• TV surgeon portrayer
• Star of Broadway's 'QED,' 2001-02
• Six-time Emmy winner