In 2007 he won the Skip Barber National Championship and was awarded the Team USA Scholarship participating in the Formula Palmer Audi Autumn Trophy, in which he finished 10th.
2008 saw him compete in the Star Mazda Series for JDC MotorSports where he captured, 1 win, 2 poles, and 7 podiums on his way to runner-up honors in the overall championship.
Miller returned in August 2010 to compete in his second Firestone Indy Lights race alongside Bryan Herta Autosport at Infineon Raceway for the Carneros 100 to finish 9th after starting from 16th on the grid.
His management firm brought in several performing artists, exotic cars, motocross demonstrations, celebrities, and a poker tournament for the event.
For 2014, Miller continues to co-drive with Nunez as the SpeedSource team moved to the Prototype class in the Tudor United SportsCar Championship.