Isachsen started with motorsports in 1989, and became Norwegian Rallycross Champion in 1999 and 2000. In 2009, 2010 and 2011 he became the European Rallycross Champion with a Ford Focus. He was also awarded the "Driver of the Year" title by the Norwegian Autosport Federation in 2010 and 2011.
In 2012 Isachen signed a three-year deal to drive the Global RallyCross Championship for Subaru PUMA Rallycross Team, together with Dave Mirra and Bucky Lasek. He drives a 2012 Subaru Impreza GR in the championship. His exploits in the Global RallyCross Championship have earned him the nickname of “The Viking Warrior” in the U.S.
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