In New York City, he completed a two-year conservatory acting program at Circle in the Square. His first role on Broadway was a play called "Any Given Day", which was performed at the Longacre Theatre.
Best known for his role as Prior Walter in Mike Nichols' screen adaptation of Tony Kushner's play, "Angels in America," he also appeared in "Love! Valour! Compassion!" both on-screen and on stage, for which he received an Obie Award for Distinguished Performance in the Ensemble.
Kirk's other films include "Chapter Zero," "The Eden Myth" and "Call o' the Glen." He made his television series debut in "Jack and Jill."
Kirk currently lives part-time in New York City, and part-time in Los Angeles.