Tessa Mossey is an actress. She started her acting career in the 2010s. She debuted in an episode of the TV series The Bay. She later appeared in the direct-to-video film San Andreas Quake. That same year, she had her first cinematic role in the 2015 feature film Sister Code. More recently, she made small appearances in the movies The Glass Castle and State Like Sleep. Her first starring role was as Jenny Quinn in the miniseries The Truth About the Harry Quebert Affair. From 2017 to 2019, she became known for her role as Heidi McKenzie in the TV series Shadowhunters.