From 2000 to 2018 David Armstrong served as the Executive Producer and Artistic Director of the 5th Avenue Theatre in Seattle. During Armstrong's tenure at The 5th, the company produced 18 new musicals, 9 of which went on to have Broadway productions including the Tony-winning productions of Hairspray and Memphis. He helped guide the 5th Avenue Theatre to a position as one of the nation's leading musical theatre companies. As a director, Armstrong helmed the 5th Avenue productions of Jacques Brel is Alive and Well & Living in Paris, A Room With a View, Oliver!, Candide, Sweeney Todd, HAIR, A Little Night Music, Company, Hello, Dolly!, Anything Goes, MAME, Pippin, The Secret Garden, Vanities, White Christmas, The Rocky Horror Show, Yankee Doodle Dandy, and Saving Aimee. He made his Broadway directing debut with the musical, Scandalous. He has also written the books for the musicals The Wonder Years (winner of seven Drama-Logue Awards), Gold Rush, and Yankee Doodle Dandy!
Armstrong is the host and producer of the popular podcast Broadway Nation.
Armstrong currently teaches Drama 171 A, The Broadway Musical.