Until 2008, he drove his own truck, Dragon Slayer. In 2008, he drove Iron Outlaw to the 2Xtreme Team owned by Jimmy Creten. Then in 2009, he got hired by Tom Meents, the owner of Max-D. For 2010, monsterjamonline.com had announced that Kreg Christensen will drive Donkey Kong, the truck debuted by Frank Krmel, who is now the driver of Fox Sports 1 Cleatus.
During the time of driving for Max-D, he also had other things going on in Australia, in which he was driving monster trucks over there. In 2013 he later left Monster Jam to do things in Australia which one of those reasons were to drive the Wicked monster truck.