He eventually moved to Los Angeles, and in early 2004, got involved with Channel101, an L.A. media collective started by Dan Harmon and Rob Schrab, where he made and acted in numerous movie shorts (such as 2 Girls One Cup: The Show and House of Cosbys) and in the VH1 television show Acceptable TV. He appeared regularly on The Sarah Silverman Program on Comedy Central as "Blonde Craig".
He now works as a voice actor, most notably as the voice of Oscar Fishtooth on Fish Hooks on Disney Channel and as a writer and animator. He also co-hosts The Grandma's Virginity Podcast, with Ryan Ridley and Jackie Buscarino. Justin was the creator of House of Cosbys.