Gregory Phillip "Greg" Grunberg (born July 11, 1966 in Los Angeles, California) is an American television and film actor. He is best known for starring as Matt Parkman on the NBC
television series Heroes
. Other notable roles include the characters Sean Blumberg on Felicity
(19982002), the pilot Seth Norris on Lost
, and Eric Weiss on Alias
(20012006), all three created and produced by his childhood friend J. J. Abrams
, and as exterminator Alex Mathis in Big Ass Spider!