Haas received an Emmy nomination for his portrayal of Ryan White in the television movie "The Ryan White Story", about an American teenager who contracted AIDS through contaminated blood treatments for hemophilia. On stage in 1988, he performed in Samuel Beckett's "Waiting for Godot" at Lincoln Center in New York City. He went on to appear in "Everyone Says I Love You", "Mars Attacks!", and "Breakfast of Champions". His work in the 2000s includes "Brick", "Last Days", and "While She Was Out".