Glenn Fitzgerald got his first acting break in the cult classic "Flirting with Disaster," by director David O. Russell. This led to roles in Lisa Krueger's film, "Manny and Lo," Ang Lee's "The Ice Storm" and "A Price Above Rubies," by director Boaz Yakin. His next films would be M. Night Shamalyian's "The Sixth Sense" and Gus Van Sant's "Finding Forester." Other films credits include "Series 7," "The Believer," "Tully," "40 Days and 40 Nights," "Igby Goes Down," "Buffalo Soldiers," "Trust the Man" and "Brief Interviews with Hideous Men."

His television credits include "Six Feet Under," "Law & Order," "Law & Order: Criminal Intent," "Homicide," "New York Undercover" and "Wonderfalls."

Fitzgerald first appeared on stage in Jon Robin Baitz's "Mizlansky/Zilinsky," opposite Nathan Lane, and in Tim Blake Nelson's "The Grey Zone." In 2001 he starred in Kenneth Lonergan's "Lobby Hero," for which he was nominated for a Lucille Lortel Award for Outstanding Lead Actor. Other theatre credits include "Blue/Orange" at the Atlantic Theatre Company, "Tatjana in Color" at The Culture Project and "Hedda Gabler" at The New York Theatre Workshop, with director Ivo van Hove.