An American actress and screenwriter, she is known for her frequent collaborations with her husband, filmmaker Mike Flanagan. She gained prominence for her roles in horror films and series such as "Hush," "Gerald's Game," and "The Haunting of Hill House." A graduate of Syracuse University, she has also appeared in "The Haunting of Bly Manor" and "Midnight Mass." Her work often explores psychological and supernatural themes, earning her a reputation in the horror genre.