[2] In 2016, after being spotted during a winning performance in a one-off Skip Barber Racing Summer Series round at Road America, Askew was selected as a Team USA Scholarship recipient.

[3] This enabled him to compete in the Formula Ford Festival and the Walter Hayes Trophy, in which Askew won his heat and finished second in the final.

[5] In May 2017, Askew joined the Rising Star Racing program which attempts to aid young American open-wheel drivers advance in their careers.

In winning the championship, Askew has been awarded a scholarship which guarantees him an entry into a minimum of three races in the 2020 IndyCar Series, including the Indianapolis 500.

[12] On October 28, 2019, Arrow McLaren SP announced that Askew, alongside Patricio O'Ward, would race full-time for the team in 2020.

[18] In July 2021 Askew tested with Rahal Letterman Lanigan Racing at Barber Motorsports Park alongside Danish Formula 2 driver Christian Lundgaard.

He recorded a top ten finish and a RLL's only Fast Six qualifying slot on a road or street course at Laguna Seca but was caught up in accidents at Portland and Long Beach.

In January 2021, Askew made his sports car racing debut at the 24 Hours of Daytona driving for Riley Motorsports in the LMP3 class.

[21] In November 2021, it was announced that Askew would reunite with Andretti to partake in his rookie season of Formula E the following year, partnering Jake Dennis.