A native of Ithaca, New York, Harrison grew up in Hadley, Massachusetts.
[2] In February 2020, Harrison was cast in a lead role in the miniseries Daisy Jones & the Six.
[3] In May 2022, he was added to the cast of the miniseries Manhunt, portraying David Herold.
[4] He also had a role in A Complete Unknown, a biopic about Bob Dylan directed by James Mangold.
[5] Alongside his Daisy Jones & the Six cast, he would win the Guild of Music Supervisors Award for Best Song Written and/or Recorded for Television in 2024.