Cassidy Isaacson began training at the age of four in her hometown of Redmond, WA, at Gotta Dance competition school. Cassidy also quickly started her ballet training at Pacific Northwest Ballet in level one, working her way up to level six before training privately with Deborah Hadley for four years. Cassidy joined Grand Rapids Ballet company at the age of 16 in 2011, where she remained until 2019, when she moved to San Francisco for Smuin Contemporary Ballet Company.
Cassidy started choreographing at the age of 16 and has made over 10 worlds premieres for Smuin alone. She continues to teach and choreograph for multiple dance schools throughout the bay.