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