MacArthur took first place at the 2003 Rebels of Comedy Competition. He has appeared on such TV shows as Mad TV, Comedy Central's Premium Blend, Pushing Daisies, and Medium.
In 2005, MacArthur co-wrote, produced and starred in a 16-minute short film, The Adventures of Big Handsome Guy and His Little Friend, with Jason Winer. The short was produced as a pilot for TV in 2006. He also appeared as a waiter in the episode of Curb Your Enthusiasm where everyone chooses Larry's wife over him after the break-up. In 2007, MacArthur appeared with fiancé Ali Larter in National Lampoon's Homo Erectus, and also appeared in a comedic supporting role in the Disney movie The Game Plan. Along with recurring roles on the television shows How I Met Your Mother and Worst Week, he appeared in supporting roles in the 2010 films She's Out of My League and Life as We Know It.
In May 2010, NBC announced that MacArthur would star in the television series Perfect Couples. The half-hour romantic comedy premiered in the second half of the 2010-2011 TV season.[3] The show was cancelled in May 2011.
In 2012, MacArthur was featured in several episodes of Whitney, as well as Go On and the Broken Lizard film The Babymakers.
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