 On September 15, 2010, Clark was traded to Houston Dynamo with allocation money in exchange for Brian Mullan and a fourth-round pick in the 2013 MLS SuperDraft (later converted to a pick in the 2013 MLS Supplemental Draft.During a nationally televised game against Seattle Sounders FC on March 23, 2012, sideline microphones picked up Clark's voice as he uttered an anti-gay slur at a ball boy who delivered him a ball for a throw-in situation.He apologized for the incident on Twitter several hours later.