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Gregory Phillip Grunberg is an American television actor. He is married to Elizabeth Grunberg and has three children. He is best-known for his role as Eric Weiss on Alias. Now currently known as Matt Parkman on the NBC series Heroes. He often organizes charity efforts to raise funds for the Pediatric Epilepsy Project in Los Angeles because his son Jake, suffers from epilepsy. He is also in an All-celebrity band including Hugh Laurie and former co-star/real-life friend Michael Vartan called "band from TV". He is life-long bestfriends with producer/director J. J. Abrams who produced 'Alias', 'Felicity' and 'Lost'. Greg has starred in most of the movies/Tv series Abrams has produced.

Grunberg left Alias as a regular to star on the NBC sit-com, 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 2004-2005 and 2005-2006 seasons, the series was never produced; however, a pilot episode was shot. Abrams also cast Grunberg in a cameo role in the pilot of his 2004 series Lost. Grunberg returned for the first-season finale, but his scenes were cut for time, and were included on the season 1 DVD set. To those who had followed the Grunberg-Abrams friendship, it was not surprising to see him appear in a small role in Mission: Impossible III , which Abrams directed.

Grunberg has also guest starred on the hit TV Show House. He has expressed interest in appearing in Star Trek XI, which Abrams will be directing; however, it is unknown what role he intends to play. Greg now has a major role in the NBC TV show Heroes. He plays a police officer named Matt Parkman who can read other people's thoughts.

Grunberg was born in Los Angeles, California, the son of Sandy (née Klein) and Gerry Grunberg, and had a Jewish upbringing. He is married to Elizabeth Dawn Wershow and has three children.

Grunberg's son, Jake, has epilepsy, which has inspired Grunberg to take an active role in raising awareness of the neurological disorder and raising funds for research. He often organizes charity efforts to raise funds for the Pediatric Epilepsy Project in Los Angeles. In the past, this has included events such as an auction of guitars handpainted by celebrities such as Donald Trump, Pink and Grunberg's "Alias" costars Jennifer Garner and Michael Vartan, concerts by the Band From TV that includes Grunberg and Hugh Laurie and an online auction of cartoons drawn of "Heroes" costars such as Santiago Cabrera, Tawny Cypress, Noah Gray-Cabey, Ali Larter, Masi Oka, Adrian Pasdar, Sendhil Ramamurthy, Leonard Roberts, Milo Ventimiglia, and Hayden Panettiere. In March 2007, Greg served as the chair of the first National Walk for Epilepsy, presented by the Epilepsy Foundation.

While appearing on G4's Holiday Hit List in 2003, Grunberg stated he is the only man in Hollywood with four g's in his name.

• He joined Weight Watchers to help his character shed some pounds.
• He doesn't like to play games that take a lot of time.
• He created and ran a very successful frozen yogurt delivery service.
• His nickname is Grunny. Greg's friends including J.J. Abrams and Michael Vartan call him Grunny.
• His brother, Bradley (Brad) Grunberg, is also an actor.
• He is 6'2" tall.