Simpson completed his first Firestone Indy Lights test at the Indianapolis Motor Speedway on May 2 and announced his participation in the Freedom 100 on May 21.

In 2014 Simpson competed full-time in the Atlantic Championship finishing 2nd in the championship with two wins and track records at Watkins Glen and VIR, and also made an appearance in Indy Lights at the Mid-Ohio Sports Car Course double header for Team Moore.

In 2017 Simpson participated in the Kart Racers of America series winning championships in both Tag Senior and 125cc Shifter.

After taking time off to focus on college and his karting business, Simpson had an opportunity to race Formula Atlantic again in 2023.

In February Simpson entered the SCCA Super Tour race at Circuit of the Americas.

In June the Pro Series traveled to Pittsburgh International Race Complex where he won on Saturday and placed second on Sunday.