Sierra McCormick is known for her diverse roles and acclaimed performances that have spanned across various genres in film and television. Born on October 28, 1997 in Asheville, North Carolina, she first gained fame by participating in the game show Are You Smarter Than a 5th Grader? before making her acting debut with a recurring role as Lilith on the television series Supernatural. She starred as Scout Thomas in the comedy television series Romantically Challenged, portrayed Alice in the film Spooky Buddies, a role which won her a Young Artist Award, and played Susan Kushner in the comedy film Ramona and Beezus. Her breakthrough came when she was chosen for the role of Olive Doyle on the Disney Channel series A.N.T. Farm.

After her success as a child actress, McCormick transitioned to more mature roles, earning critical acclaim for her role as Moira in the horror indie film Some Kind of Hate. Her performance as Fay Crocker in the science fiction film The Vast of Night received a nomination from the Critics' Choice Super Awards. McCormick has since starred as Melissa in the horror film We Need to Do Something, took on the role of Scarlett Winslow in the Hulu series American Horror Stories, and played Sybil in the thriller film The Last Stop in Yuma County. This multifaceted actress continues to captivate audiences with her powerful performances.