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

His musicals include The Kingdom of Grimm (Chicago Playworks in Chicago), God and Country (Victory Gardens Theater); The Real Life Story of Johnny De Facto (Goodspeed-At-Chester in Connecticut, National Alliance For Musical Theatre 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 Theater, and other productions at over 225 theatres around the world).

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