As a child, Riegel appeared in several commercials, short films and episodic television work. After graduating high school, she made her stage debut in 2012 playing the title role from youth to old age, in Tony Award-winning playwright
David Henry Hwang's
Golden Child revival at the
Signature Theatre. Erik Haagensen of
Backstage described her performance as "10-year-old Ahn [as] radiantly mischievous, a quality she smartly retains when Ahn is 60." In 2013, she was cast as a series regular in the
HBO television series
The Leftovers. In 2014, she appeared in
Marc Lawrence's romantic comedy
The Rewrite. In 2018, she appeared in the
Ben Stiller-produced Netflix film
Alex Strangelove. In 2019, she was announced as one of the cast members of
Into the Darks back-to-school installment, "School Spirit", which premiered on
Hulu two months later. She is the first Asian American lead in Blumhouse production history. In January 2022, she was cast in a recurring role as Juliette Tan for
Kung Fu (2021–present), a reboot of the
1972 series of the same name. In August 2022, she joined the cast of the
Hulu television series
Death and Other Details. As a voiceover artist, she has narrated many audiobooks, and her work has garnered her an AudioFile magazine Earphones Award. ==Personal life==