Born in St. Louis, Missouri, Andreas from a working-class Greek-American family. Attracted from early childhood to being on stage when at 4 his mother took him to see a community theater performance, he took theatre as an extra-curricular activity in high school. He then majored in it at St. Louis University, where he worked his way through school doing things like waiting on tables. Next, after earning a drama fellowship, Katsulas received a Master's Degree in Theater Arts from one of the nation's top schools for the genre, Indiana University in Bloomington, Indiana.
