[5]At a young age, Milner would test and consult amateur racing game mods, whom of which are now the founders of Slightly Mad Studios.

[6] Milner started karting at the age of 14 and began his career as a sports car driver in the 2004 and 2005 Grand-Am seasons.

In addition to driving for Corvette Racing, he also drove for Team Need for Speed Schubert at the 2011 24 Hours of Nürburgring.

The highlight of Milner's career so far is a class victory at the 2011 24 Hours of Le Mans driving a Chevrolet Corvette C6.R with teammates Antonio García and Olivier Beretta.

He also achieved a class victory at the 2022 6 Hours of Monza driving the Chevrolet Corvette C8.R with co-driver Nick Tandy.