Gregory Phillip "Greg" Grunberg (born July 11, 1966) is an American television actor. He is currently starring as Matt Parkman on the NBC television series Heroes, ongoing since 2006. Other notable roles included the characters Sean Blumberg on Felicity (1998â??2002) and Eric Weiss on Alias (2001â??2006), both produced by childhood friend, J. J. Abrams.