Matt Griesser is an actor, comedian that currently appears in Christopher Guest's Netflix movie, MASCOTS (2016). This is his 5th time being cast and directed by Christopher Guest.

In 2013, Griesser played Rick Tillman in Guest's original series for HBO, "Family Tree".

His career began performing ensemble improv with Second City Alumni in Los Angeles, CA. He studied under improv greats, Ryan Stiles and Jane Morris, while frequently performing at Up Front Comedy, The IceHouse and Improv Olympic.

After appearing in many national television commercials and several sitcom guest spots, he was cast as the signature character he's best known for, "SIGN BOY." For 8 seasons Matt played the traveling standard bearer in the world of professional golf for the FootJoy golf brand. Over the course of the campaign's run, Matt performed and often improvised a large part of more than 50 international FootJoy television spots. "SIGN BOY" was a regular fixture in professional golf, appearing with the likes of Adam Scott, Phil Mickelson, Ernie Els and Luke Donald.

During that same time, for three seasons, Matt also played sidekick host to PGA Pro, Peter Jacobsen on the Golf Channel's original series, "Peter Jacobsen: Plugged In." He was often sent "on assignment" while filming this comedic 1/2 hour variety, comedy/golf show – traveling to shoot on location in unexpected places such as Iceland and Guantanamo Bay, Cuba.

In 2010, he was cast and directed by improv master, Christopher Guest, to appear in a string of television spots for Radio Shack. Matt played the character, "Alphonse", personal assistant to 7 time Tour de France champion, Lance Armstrong.

Matt has appeared in two feature films, "The Flintstone: Viva Rock Vegas and Cameron Crowe's, "Almost Famous." As well as such TV shows as "10 Items or Less", "King of Queens", "'Til Death" and "Rules of Engagement".

He currently voices the Immature Cheese (cheese wheel) for the CHEEZ IT brand in their television advertising. During football season you can often catch his voice during ESPN's College GameDay coverage.