Before he was an award-winning playwright, screenwriter and director, Moss Hart was a poor, stage-struck Brooklyn dreamer who, after years of writing submissions, rejections galore and sheer persistence, finally grasped the brass ring. He chronicled the sweatiness and sweetness of his first success in the colorful 1959 memoir Act One, which quickly became one of the signature books about the theater. Veteran studio head and Sunrise at C