Years after graduating from college, Cohen moved to Toronto, where he studied acting and landed his first voice over job, without an agent, on the animated TV series Pippi Longstocking.[citation needed] He began his career when he appeared in Moville Mysteries, shortly after which he appeared in Queer as Folk, Doc, RoboRoach, and Henry's World, as well as many commercials. In 2005, he won the national Moc Docs award for Best Mockumentary for his short film Jew Jube Lives—a rap parody based on the question, "If Eminem were Jewish and grew up in Thornhill, what would he be like?" He was the voice of Ty Archer in the animated TV series Grossology for which he and the ensemble received a Gemini Award nomination, the Canadian equivalent of an Emmy.
Since 2014, Cohen has played Schwoz Schwartz on the sitcom Henry Danger,[3] a role he continues in the Henry Danger spinoff series Danger Force.[4] He has appeared on shows such as Modern Family, The Real O'Neals, 2 Broke Girls, The Mindy Project, Backstrom, Eagleheart and Austin & Ally. His recent film credits include the comedy Suburbicon, directed by George Clooney and written by the Coen brothers; the Oscar-nominated film Whiplash; and the Canadian Screen Award-nominated film It Was You Charlie, for which he was nominated for an ACTRA Award for Outstanding Lead Performance.
Cohen has dozens of commercial credits including Mini Starburst, FedEx, Capital One, Boston Market, Honda (with Patrick Warburton), and the Super Bowl Hulu Plus campaign with Will Arnett. Cohen was co-chair of the SAG-AFTRAHollywood Conservatory at the American Film Institute l, and is a member of the National SAG-AFTRA Conservatory Committee. He has a master's degree in adult education focusing on transformative education for performers. He offers acting workshops and private audition coaching for actors in L.A., Toronto and around the world. He resides in Los Angeles.