(1856–1933), agent. The daughter of a famous New York attorney, she was encouraged by Daniel Frohman to become an author's agent. Most of her early clients were foreign playwrights, such as Victorien Sardou, Oscar Wilde, Somerset Maugham, and Sir James Barrie. Marbury is believed to have been the first agent to negotiate a percentage of box office receipts for her clients. She later began to represent important American figures, including Clyde Fitch, Rachel Crothers, and Jerome Kern. In connection with Kern, it was she who apparently suggested to Ray Comstock that the small Princess Theatre be turned into a house for intimate musicals, thus creating the stage for the Princess Theatre Musicals that helped make Kern, Guy Bolton, and P. G. Wodehouse famous. Autobiography: My Crystal Ball, 1924.
From The Oxford Companion to American Theatre in Oxford Reference.