Hilario Grajeda  Hilario Grajeda (born February 9, 1967) is an American soccer referee. He has been a referee in Major League Soccer since 2004. His first match in the MLS was a game between Dallas Burn and Kansas City Wizards in July 2004. On July 31, 2013, he was the first referee to try out the "Ref Cam" in a friendly game between A.S. Roma and MLS All-Stars, a head-mounted camera that gives the fans the opportunity to see the game in the referee's point of view.