A prolific character actor for nearly four decades, Mark Margolis amassed an impressive resume of supporting roles in projects ranging from "Scarface" (1983) and "Oz" (HBO, 1997-2003) to a hailed performance as a once vicious mob enforcer in "Breaking Bad" (AMC, 2008-12). As with all great character actors, Margolis excelled at a particular type, with his specialty being cagey, often hot-tempered men of authority on both sides of the law, often of Italian or Latin extraction. However, director Darren Aronofsky - who cast him in nearly all his films - tapped further into Margolis' talents for more nuanced characters, including a math professor in "Pi" (1998), a seedy supermarket manager in "The Wrestler" (2008) and a ballet patron in "Black Swan" (2010). After decades of steady work in nearly all mediums, Margolis landed his breakout role as Hector "Tio" Salamanca on "Breaking Bad," a once-lethal Mexican mob enforcer rendered speechless and immobile by a stroke, but who is still capable of unleashing considerable mayhem. His extraordinarily malevolent turn earned him long-overdue praise, underscoring Margolis' enduring status as one of show business' most capable character actors.