David Sullivan is an American actor. He first appeared in the 2004 film Primer, after which he made his TV debut in Joey. He later had minor roles in the movies The Astronaut Farmer, Karma Police, and The Lodger. At the same time, he had several guest appearances on the small screen. His first recurring role came in 2010 with the role of Adrian on Gigantic. He also had performances in the films Skateland, Extracted, Ben Banks, The Veil, and In Dubious Battle. In 2017, he appeared in the Netflix movie Deidra & Laney Rob a Train. As of 2016, he stars as Dennis on the web comedy series Flaked.