Matthew Joseph O'Leary is an American actor. He made his debut in the made-for-television Disney Channel Original film Mom's Got a Date with a Vampire (2000), and would go on to star in the thriller Domestic Disturbance (2001) opposite John Travolta. He also had supporting roles in Frailty (2001), and the independent neo-noir film Brick (2005). In 2011, he starred opposite Rachael Harris in the critically acclaimed independent film Natural Selection, followed by a lead role in Fat Kid Rules the World (2012). He had a minor part in Gore Verbinski's The Lone Ranger (2013), and lead roles in the horror films Stung (2015) and Bokeh (2017).