Miller saw an early success winning over 60 International Karting Federation races which included breaking the track record at his home circuit, Oakland Valley Raceway.

That season he secured a track record at the Salt Lake Grand Prix and qualified on pole at The Mosport Grand-Prix.

[3] In June 2010, Miller joined up with JMW Motorsport to compete in the 2010 24 Hours of Le Mans with co-drivers Rob Bell and Tim Sugden.

In the 2011 24 Hours of Le Mans, he joined Team Felbermayr-Proton, driving a Porsche 997 GT3-RSR with co-drivers Nick Tandy and Abdulaziz Al-Faisal.

Miller partnered with full-season co-drivers Christopher Haase and Dion von Moltke in the Rolex 24 At Daytona and 12 Hours of Sebring, moving 2015 off to a fast start with a pair of fifth-place finishes.