He began in amateur theater and later as an actor with
A. M. Palmer's organization before returning to teaching at the
American Academy of Dramatic Arts. By 1882 de Mille was employed at the
Madison Square Theatre reviewing and later revising submitted plays, during which he became acquainted with the playwrights
Steele MacKaye and
David Belasco. A short while later de Mille would join forces with David Belasco in a collaborative effort that would prove to have a greater box-office appeal with the theatergoing public.
Lord Chumley; or the Knight of Lummy Tum a three-act comedy written for
E. H. Sothern was well received on August 21, 1888, The following season the two produced
Men and Women at the
Proctor's Twenty-third Street Theatre. The drama opened on October 20, 1890, and starred
Maude Adams in a tale about business and politics in America. Belasco and de Mille chose to go their separate ways by 1891. Later that October de Mille produced
The Lost Paradise, his adaptation of the
Ludwig Fulda play
Das Verlorene Paradies. The production by Charles Frohman's company proved to be another success and was considered to be de Mille's best work to date. As he was finishing
The Lost Paradise, de Mille read
Henry George's famous treatise
Progress and Poverty and immediately became a dedicated
Georgist "single-taxer". De Mille resolved to write a conclusion to
The Lost Paradise called
The Promised Land, based on the teachings of George, but de Mille died of typhoid fever less than a year later and before it could be finished. ==Marriage==