Sarah Gadon

 is an actress and director who portrayed Sadie Dunhill, the librarian at Jodie High School.

Biography
Gadon was born in Toronto, Ontario, to a teacher mother and a psychologist father. Sarah spent much of her adolescence training as a performer as a Junior Associate at the National Ballet School of Canada and as a student at the Claude Watson School for the Performing Arts. She also studied cinema at the prestigious University of Toronto.

She is known for her roles in the films "A Dangerous Method" (2011), "Antiviral" (2012), "Enemy" (2013), "Indignation" (2016), and the mini-series 11.22.63 (2016).

Source
Sarah Gadon on the Internet Movie Database. Retrieved on April 2, 2019.