[2] Nielsen is best known for his recurring role as Garrett Lambert in the television comedy series Community from 2009 to 2015.
[3] His other acting credits include Bad Milo (2013) and the pilot episode of IFC's Maron.
He also starred in Erik the Librarian,[4] a web series created by Brent Forrester.
[5] Nielsen has appeared on Just for Laughs, Conan, and on HBO Canada's stand-up series Funny as Hell.
On December 10, 2014 he appeared on Ken Reid's TV Guidance Counselor Podcast.