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 Tribe… Read more
Known for How I Met Your Mother 2005 Life As We Know It 2010 She's Out of My League 2010 The Game Plan 2007 Series ★ 8 The Runarounds 2025
Finn Cooper ★ 6.2 Dear Santa 2024
Bill Turner Series ★ 5.7 History of the World: Part II 2023
Mark ★ 5.3 The Binge 2020
★ 6.6 The Way Back 2020
Eric (uncredited) ★ 6.6 Being Frank 2019
Stan ★ 5.9 I'm Just F*cking with You 2019
Chester Series ★ 7.7 The Morning Show 2019
Marlon Tate Series ★ 6.4 Merry Happy Whatever 2019
Sean Quinn ★ 5.9 Super Troopers 2 2018
Mountie Podien Series ★ 6.9 Single Parents 2018
Xander Fogerty ★ 6 Director's Cut 2016
Reed Series ★ 6.4 Angie Tribeca 2016
Jay Geils ★ 5.6 Someone Marry Barry 2014
Rafe ★ 6.2 A Haunted House 2 2014
Ned Series ★ 7.5 Looking 2014
Barry Foster Series ★ 6.5 Friends with Better Lives 2014
Zac ★ 5.6 The Motel Life 2013
Officer Cook ★ 5.4 Bachelorette 2012
Dale Beaumont ★ 4.7 Jewtopia 2012
Chuck O'Connell ★ 5 The Babymakers 2012
Leslie Jenkins Series ★ 6.5 Go On 2012
Wyatt Series ★ 7.7 Key & Peele 2012
Jack ★ 7 Prep & Landing: Naughty vs. Nice 2011
Thrasher (voice) Series ★ 5.2 Whitney 2011
Lance Series ★ 6.9 Happy Endings 2011
Steven Series ★ 6.7 Suburgatory 2011
Walter ★ 6.9 Life As We Know It 2010
Peter Novak ★ 6.5 She's Out of My League 2010
Ron ★ 6.9 Prep & Landing 2009
Thrasher (voice) ★ 4.6 Lower Learning 2008
Digdug O'Shaughnessy ★ 6.5 The Game Plan 2007
Kyle Cooper ★ 4 Homo Erectus 2007
Thudnik ★ 5.4 Look 2007
Tony Gilbert ★ 5.8 Are We Done Yet? 2007
Jimmy the Bartender Series ★ 7.9 Pushing Daisies 2007
Buddy Amicus Series ★ 8.1 How I Met Your Mother 2005
Curt Series ★ 7.5 Medium 2005
Randy Pilgrim Series ★ 7.4 Entourage 2004
Levinson Series ★ 8 Curb Your Enthusiasm 2000
Doorman Series ★ 7.1 The King of Queens 1998
Ed 
