Cassidy is an American actor and attorney born in Vermont and raised in Walpole, New Hampshire by his parents Christine, a nurse, and John, a carpenter. For over a decade, Cassidy has been acting in commercials, film, and television. Cassidy has been featured in films such as Spenser Confidential (2020) opposite Mark Wahlberg and Post Malone, About Fate (2022) opposite Emma Roberts, and Season 2 of Castle Rock (2020) opposite Tim Robbins.