Michael Sheen was well known on London's dramatic stages for nearly a decade when his Broadway lead in "Amadeus" (1999) unleashed one of the U. K.'s best kept secrets on international audiences. The West End continued to be his anchor, with acclaimed roles in "Look Back in Anger" and "Caligula," but Sheen grew increasingly more familiar to filmgoers with supporting roles in the gothic horror film series "Underworld" (2003) and the romantic comedy "Laws of Attraction" (2004). His collaborations with writer Peter Morgan were among his best-known, including his memorable portrayal of British Prime Minister Tony Blair in Morgan's "The Queen" (2006), and as political interviewer David Frost in "Frost/Nixon." The resounding success of the latter Morgan work led to a run on Broadway and a Hollywood film adaptation by Ron Howard (2008), both of which co-starred Sheen and Frank Langella. For the third time in his career, he played Tony Blair, this time in "The Special Relationship" (HBO, 2010), before co-starring with Jeff Bridges in "Tron: Legacy" (2010) and opposite Rachel McAdams in Woody Allen's "Midnight in Paris" (2011) and starring in the American-made television drama "Masters of Sex" as controversial 1950s sex researcher Dr. William Masters. Whether he was appearing in historical dramas, big budget fantasies or small indies, Michael Sheen was an intense and passionate performer who was one of the few Welsh exports to make it big in America.