Brier was born on August 4, 1994, to
Susan Cinoman, a playwright and former sketch comedian, and a cardiologist father. She is
Jewish and has one older sister who works as a producer. Brier's parents divorced when she was five years old. She attended
Amity Regional High School in
Woodbridge, Connecticut and, while there, performed a monologue from
The Taming of the Shrew for a Shakespeare competition in which she won first place. She then attended
Smith College, where she majored in theater while taking improv classes. During college, she was an intern for the
sixth season of the
ABC political thriller series
Scandal. She graduated in 2017 and soon moved to
New York City. Brier found success on
TikTok, where she began posting in 2021, through posting skits in which she played privileged, self-involved characters, such as the "Extremely Passive Aggressive Roommate". , she is represented by
Creative Artists Agency. In October 2023, for
The Guardian, JD Reforma wrote of Brier that she had "elevated the loyal-but-basic best friend archetype into something sublime". By 2024, videos of Brier saying "Oh!" became a popular
reaction meme online, particularly on
Twitter. In February 2024, she guest starred as Jessca, a substitute teacher, in "Smoking", an episode in
season three of
Abbott Elementary. By June 2024, Brier had over 800,000 followers on TikTok. In January 2025, Brier released the
audiobook,
That Friend, about an influencer in New York City with an advice podcast whose life starts to fall apart, through
Simon & Schuster. ==Filmography==