Film and television Encouraged by his father, Braun began to take acting classes at a very young age. He made his film debut in
Sky High. He had roles in the
Disney Channel Original Movies Minutemen (2008) and
Princess Protection Program (2009). until it was cancelled with its final episode airing on May 24, 2010. He appeared in
The Secret Life of the American Teenager and portrayed the character Cole Waters on the web series
The LXD. In 2011, he played Lloyd Taylor in Disney's theatrical release
Prom, and Billy Ray in
Kevin Smith's
Red State. The following year, he had a supporting role in the
coming-of-age film
The Perks of Being a Wallflower (2012). In 2015, he was featured on two tracks of the Phantoms' debut EP,
Broken Halo. He provided vocals on the title track and on "Voyeur". He also co-starred in both
Date and Switch (2014) and
How to Be Single (2016). He played Derrek in the
A24 drama film
Zola (2021), which was directed by
Janicza Bravo and written by
Jeremy O. Harris. The film received positive reviews. In 2018, Braun became a member of the main cast of the
HBO drama series
Succession, playing Gregory Hirsch. For his performance in the show, Braun received critical acclaim and was nominated three times—in 2020, 2022, and 2023—for a
Primetime Emmy Award for Outstanding Supporting Actor in a Drama Series. On July 29, 2020, Braun released the music video for his single "Antibodies (Do You Have The)". He stated that the song was made in partnership with
Partners In Health and the COPE Program to encourage listeners to donate in support of those most at risk from the pandemic. In 2022, he appeared in the
IFC mockumentary series
Documentary Now! episode "
Soldier of Illusion, Parts 1 & 2", directed by Alex Buono and
Rhys Thomas. The installment parodied the films of
Werner Herzog and was written by
John Mulaney. Braun starred in the
Susanna Fogel drama
Cat Person (2023), which premiered at the
2023 Sundance Film Festival. The film is based on the
2017 short story featured in
The New Yorker, which was released amid the
MeToo movement. Braun then appeared in the fantasy film
Dream Scenario, directed by
Kristoffer Borgli. He was cast as both filmmaker
Jim Henson and entertainer
Andy Kaufman for the 2024 biographical
dramedy Saturday Night and will appear in the 2026 thriller
Three Bags Full: A Sheep Detective Movie, based on the
novel by the same name.
Theatre Braun made his professional stage debut as Doug in the 2025 off-Broadway revival of
Rajiv Joseph's play
Gruesome Playground Injuries at the
Lucille Lortel Theatre. He will make his Broadway debut in
All Out: Comedy About Ambition in February 2026. ==Other ventures==