American dramatist remembered for such plays as Adam and Eva and The Failures. He also wrote an acclaimed 1947 memoir These Things are Mine.
Over the course of his theatrical career, he worked as a producer and director as well as a playwright.
As president of the Dramatists Guild of America, he drafted what became the standard agreement regarding stage royalties.
He wed women's suffragist Flora Dodge La Follette in 1911.
He was a contemporary of fellow playwright John Drinkwater.