Britton grew up in Sonoma County, California, graduating from Analy High School in Sebastopol in 2004.

[3] Britton had his breakout role as Ed Kemper in the 2017 Netflix crime drama Mindhunter.

He played hacker Plague in the 2018 crime thriller film The Girl in the Spider's Web.

[4] In the Netflix TV show The Umbrella Academy, he played the role of Hazel, a time-travelling assassin.

[5] He stars as the falsely suspected 1996 Olympic Games bomber Richard Jewell in the second season of the Manhunt drama anthology series.