With Rowe, he wrote the book and lyrics for Zombie Prom (1995),[1] The Fix (directed by Sam Mendes, 1997),[2] and the stage adaptation of John Updike's The Witches of Eastwick (2000).
[3] Rowe and Dempsey were nominated for the Olivier Award for The Fix and The Witches of Eastwick, both of which were produced in London by Cameron Mackintosh.
[2][3][4] He was the co-lyricist for The Pirate Queen, collaborating with composer Claude-Michel Schönberg and lyricist Alain Boublil.
[5] With playwright/lyricist Rinne Groff and composer Michael Friedman, Dempsey co-wrote the book and lyrics for the musical adaptation of the movie Saved!, which was produced by Playwrights Horizons in New York City in 2008.
[6] An original musical by Dempsey and Rowe, Brother Russia, in which a "fourth-rate Russian theatre troupe... in a desolate potato field north of Omsk" proves to be led by the seemingly immortal Rasputin, premiered between March 6 and April 15, 2012, by the Signature Theatre in Arlington, Virginia.