Gregory Phillip Grunberg (born July 11, 1966) is an American television and film actor. He is best known for starring as Eric Weiss in the ABC series Alias, Matt Parkman in the NBC series Heroes, "Snap" Wexley in the Star Wars sequel trilogy, and Phil in A Star Is Born. He has often appeared in works produced and directed by his childhood friend J. J. Abrams like Felicity as Sean Blumberg. He was a recurring cast member in the first two seasons of the Showtime American television drama series Masters of Sex.
Grunberg was born in Los Angeles, California, the son of Sandy (née Klein) and Gerry Grunberg, and had a Jewish upbringing. He attended University High School in West Los Angeles.
Grunberg got his first credited role in Matt Stone and Trey Parker's 1998 film BASEketball. From 1998–2002 he appeared as Sean Blumberg on Felicity. He appeared from 2001–06 as Eric Weiss on Alias. He left that series as a regular to star on the NBC sitcom, Grand Union. Since 2003, Abrams had planned a series called The Catch about a bounty hunter, starring Grunberg in the lead role. Suggested for both the 2004–05 and 2005–06 seasons, the series was never produced; however, a pilot episode was shot.