Douglas Post's plays include Cynical Weathers (Victory Gardens Theater in Chicago), Somebody Foreign (City Lit Theater in Chicago, Stage Left's Festival of New Work in Chicago, Midwest New Plays Festival in Chicago), Blissfield (Victory Gardens Theater); Forty-Two Stories (L.A. Theater Works); Drowning Sorrows (Third Stage in Los Angeles, Victory Gardens Theater, Shelykova Playwrights Conference in Russia, O'Neill National Playwrights Conference in Connecticut); Personal Effects (Circle Theater in Chicago, Toledo Repertoire Theater, Carnegie Mellon Drama Showcase of New Plays in Pittsburgh); Earth and Sky (Second Thought Theatre in Dallas, Circle Theater, Nuffield Theater in England and British Tour, Copperview Theater Company in Los Angeles, Actors Forum Theater in Los Angeles, Victory Gardens, Second Stage in New York, O'Neill National Playwrights Conference); Suffering Fools (Commons Theater in Chicago, O'Neill National Playwrights Conference); Murder in Green Meadows (Studio Arena Theater in New York, Vienna's English Theater in Austria, Totem Pole Playhouse in Pennsylvania, Horse Cave Theater in Kentucky, Contemporary American Theater Company in Ohio, English Theater of Hamburg in Germany, Circle Theater, Victory Gardens, Stamford Theater Works in Connecticut, Nuffield Theater); Detective Sketches (Lincoln Center Theater Lab in New York, Theater-A-Go-Go in Los Angeles, Organic Lab in Chicago); and Belongings and Longings (Thirteenth Street Repertory in New York, Organic Lab).

His musicals include The Kingdom of Grimm (Chicago Playworks in Chicago), God and Country (Victory Gardens); The Real Life Story of Johnny De Facto (Goodspeed-At-Chester in Connecticut, National Alliance For Musical Theater Festival of New Work in New York, O'Neill National Music Theater Conference); Songcycle: The Other Wise Man, Gethsemane and Everyman (Cafe Voltaire in Chicago, Bailiwick Repertory in Chicago, Leo A. Lerner Theater in Chicago); and The Wind in the Willows (Theater Off Park in New York, Cleveland Play House, Organic Lab, and other productions at over two hundred theaters across the country).

His radio and television work includes Forty-Two Stories (Chicago Theaters On The Air); Drowning Sorrows (Chicago Theaters On The Air); Earth and Sky (XM Satellite Radio, National Public Radio, L.A. Theater Works, Chicago Theaters On The Air); and a one-act version of Murder in Green Meadows (with the Steppenwolf Theater Company for the NBC Chicago Playwrights Festival). He has also been commissioned to write screenplays for Warner Bros. and NBC.