Jay Cassidy is an American film editor with dozens of credits since 1978. Cassidy began his career in the 1970s working on documentaries and political advertising. He has had a notable collaboration with Sean Penn, having edited all of the films directed by Penn. Early in his career, Cassidy edited the documentary film High Schools (1983) that was directed by Charles Guggenheim; more recently he has edited several documentaries by Guggenheim's son Davis Guggenheim, including An Inconvenient Tru ...