MacArthur completed his high school studies at Deerfield Academy. After this, he joined Bowdoin College to pursue a Bachelor’s in Government. To pursue his interest in acting, he later enrolled in Groundlings Theater Company and Atlantic Theater Company, too. He made his feature film debut with Homo Erectus, portraying Thudnik. However, he is most widely known for playing Jay Geils in Angie Tribeca. His other acting credits also include Go On, Worst Week, A Haunted House 2, Being Frank, and others. He also made guest appearances in popular shows like How I Met Your Mother and Happy Endings. —via yahoo movies

Filmography

• 2026A Love Like This — Paul, Producer
• The Runarounds — Finn Cooper
• 2024Dear Santa — Bill Turner
• History of the World: Part II — Mark
• 2020The Binge
• 2020The Way Back — Eric (uncredited)
• 2019Being Frank — Stan
• 2019I'm Just F*cking with You — Chester
• Merry Happy Whatever — Sean Quinn
• Mr. Mom — Greg Anderson
• The Morning Show — Marlon Tate
• Single Parents — Xander Fogerty
• 2018Super Troopers 2 — Mountie Podien
• Angie Tribeca — Jay Geils
• 2016Director's Cut — Reed
• 2014A Haunted House 2 — Ned
• Friends with Better Lives — Zac
• Looking — Barry Foster
• Really — Charlie
• 2014Someone Marry Barry — Rafe
• The Rebels — Rick Massella
• 2013The Motel Life — Officer Cook
• 2012Bachelorette — Dale Beaumont
• Go On — Wyatt
• 2012Jewtopia — Chuck O'Connell
• Key & Peele — Jack
• 2012Prep & Landing: Totally Tinsel Collection — Thrasher (voice)
• 2012The Babymakers — Leslie Jenkins
• Happy Endings — Steven
• 2011Prep & Landing: Naughty vs. Nice — Thrasher (voice)
• Suburgatory — Walter
• Whitney — Lance
• 2010Life As We Know It — Peter Novak
• Perfect Couples — Rex
• 2010She's Out of My League — Ron
• 2009Prep & Landing — Thrasher (voice)
• 2008Lower Learning — Digdug O'Shaughnessy
• 2007Are We Done Yet? — Jimmy the Bartender
• 2007Homo Erectus — Thudnik
• 2007Look — Tony Gilbert
• Pushing Daisies — Buddy Amicus
• 2007The Game Plan — Kyle Cooper
• How I Met Your Mother — Curt
• Medium — Randy Pilgrim
• 2005The Adventures of Big Handsome Guy and His Little Friend — Guy Hansen, Writer, Producer
• Entourage — Levinson
• Curb Your Enthusiasm — Doorman
• The King of Queens — Ed

Appearances as themselves (1)

• Late Night with Seth Meyers — Self - Guest