Long's film credits include
Idiocracy,
Waiting...,
Jeepers Creepers,
DodgeBall: A True Underdog Story,
The Break-Up,
Crossroads,
Galaxy Quest,
Dreamland and
Live Free or Die Hard. He was also a regular on the
NBC TV series
Ed (2000–04) as socially awkward Warren P. Cheswick. He was offered the opportunity to replace Steve Burns on ''
Blue's Clues after he left the show, but ultimately declined. He was the voice of Alvin in Alvin and the Chipmunks, Alvin and the Chipmunks: The Squeakquel, Alvin and the Chipmunks: Chipwrecked, and Alvin and the Chipmunks: The Road Chip. He also played the main character in the comedy film Accepted'' (2006). Long made a guest appearance in the
documentary,
Wild West Comedy Show (2006). In 2007, he co-starred with
Bruce Willis as a
white-hat hacker in
Live Free or Die Hard and had a role in the comedy
The Sasquatch Gang. Long is known for his depiction of a
Mac in
Apple's "
Get a Mac"
campaign. The campaign featured commercials in which Long as a Mac and
John Hodgman as a
PC engaged in playful banter about "the strengths of the Mac platform and weaknesses of the PC platform." Long also had a small role in the comedy film
Zack and Miri Make a Porno (2008) as Brandon St. Randy, a gay porn star. In 2009, he starred in ''
He's Just Not That into You with co-star Ginnifer Goodwin and After.Life opposite Liam Neeson and Christina Ricci. He also provided the voice of Humphrey in Alpha and Omega (2010), starring with Hayden Panettiere. Also in 2010, he starred in the comedy film Going the Distance'' with
Drew Barrymore. He was cast as a one-armed Civil War veteran in Robert Redford's
The Conspirator. Long recorded the
audiobook version of
Judy Blume's ''
Then Again, Maybe I Won't'' and
Stephen King's ''
Everything's Eventual. From July 7–18, 2010, he appeared in a production of Samuel J. and K.
at the Williamstown Theatre Festival. On August 16, 2010, he co-hosted WWE Raw with Going the Distance'' co-stars
Charlie Day and
Jason Sudeikis at the
Staples Center in Los Angeles. In 2014, he starred in the independent love drama
Comet, which he and his co-star,
Emmy Rossum, also produced. That same year, he starred in the
Kevin Smith body horror-
dark comedy film
Tusk, about a man's lifelong fascination with
walruses and extreme,
fetishized body modification and
cosmetic surgery. Also in 2014, Long appeared in a few skits on
Inside Amy Schumer. In April 2019, he started the podcast
Life Is Short with Justin Long; its introductory episode aired through
Wondery on May 13, 2019. His first guest was actor
Neil Patrick Harris. On June 24, 2019, Long, along with an ensemble cast, presented
The Investigation: A Search for the Truth in Ten Acts, a dramatic reading of Special Counsel
Robert S. Mueller III's
Report on the Investigation into Russian Interference in the 2016 Presidential Election. Long portrayed former Director of the
Federal Bureau of Investigation James Comey. In 2020, he appeared in the reality television series
Celebrity Watch Party alongside his younger brother Christian Long. He appeared in commercials for
Intel's "Go PC"
campaign. ==Personal life==