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Arguably the greatest American trials rider ever, Aaron holds a record 10 AMA National Trials championships (trials bikes resemble mountain bikes with an engine attached; the goal is to clear obstacles without dabbing feet, or crashing). Aaron tried Endurocross on a regular dirtbike for fun in 2004 and quickly fell for it. He kept working on his speed until he became a genuine title threat. By 2007 he retired from trials competition and focused exclusively on Endurocross. Second in the AMA EnduroCross standings in 2009 and 2010. Has 2 career wins and is usually two-time EnduroCross champ Taddy Blazusiak's toughest competitor. A sharp businessman and promoter of trials, Aaron runs trials demos for Red Bull, doing around 40 shows per year.