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Mazzello's first film role in the 2000s was in 2001s "Wooly Boys". In 2002, Mazzello made his television debut on "Providence". He then appeared on CBS hit shows ' and "Without a Trace". Afterwards, he appeared in "Raising Helen" (2004), ' (2004), "" (2006), and the short film "Beyond All Boundaries" (2009). Mazzello made his directorial debut with the short film "Matters of Life and Death" (2007).