Christopher Diamantopoulos[1] (Greek: Χριστόφορος Διαμαντόπουλος (Khristóforos Diamantópoulos); born May 9, 1975) is a Canadian actor.

[7] A short time later, he worked on Broadway, where he played leading parts in The Full Monty (2002) and Les Misérables (2003).

He played Robin Williams in Behind the Camera: The Unauthorized Story of Mork & Mindy alongside Erinn Hayes.

He had recurring roles on the NBC sitcoms Up All Night, as Maya Rudolph's on and off lover, Julian; The Office, as Brian, a former member of the show's documentary film crew (alongside Zach Woods, who he would later work again with on Silicon Valley); and on Arrested Development, as Marky, Lindsay's face-blind environmentalist boyfriend.

On October 11, 2018, it was revealed by TVLine that he would have a role in the spin-off pilot for the situation comedy The Middle playing Sue Heck's mercurial, charming and rich boss Nick.

[9] He has an upcoming starring role alongside Tom Blyth in the comedy Discussion Materials[10] adapted from Bill Keenan's memoir of the same name.