Film:
* The Hangover (2009): He plays the hilarious character of Alan Garner's (Zach Galifianakis) friend at the wedding.
* The Hangover Part II (2011): He reprises his role as Alan Garner's friend in the sequel.
* The Hangover Part III (2013): He appears once again as Alan Garner's friend in the final installment of the trilogy.
* The Interview (2014): He plays the role of a news reporter.
Television:
* The Office (US): He plays the recurring role of Michael Scott's friend and former boss, Bob Vance, Vance Refrigeration. He appears in several episodes, bringing a unique blend of humor and awkwardness to the show.
* Parks and Recreation (2010-2015): He has guest appearances in several episodes, including the memorable "The Comeback Kid" episode where he plays Dave, a member of the Pawnee Parks Department.
* The Sarah Silverman Program (2007-2010): He had a recurring role as Steve, Sarah's boyfriend.
* New Girl (2011-2018): He plays the role of Ferguson, the landlord, in a few episodes.
* Arrested Development (2003-2006, 2013-2019): He appears as Roger, a man in a hospital bed.
* Key & Peele (2012-2015): He had a recurring role as Dan, the news producer.
* Crazy Ex-Girlfriend (2015-2019): He plays Josh's boss, a character named Kenny, in a few episodes.
This list covers just some of Peter Gros's memorable roles, but he has been involved in many other film and television projects. He has a knack for comedic timing and creating memorable characters, making him a popular figure in the entertainment industry.
If you're interested in exploring his work further, you can easily find his filmography on websites like IMDb or Rotten Tomatoes.