He teaches large introductory biology courses for science and non-science majors. His research concentrates on developing and testing methods for improving instruction in large classes and he has published articles examining cooperative-learning, inquiry-based learning, and writing-to-learn strategies. Norris also uses a variety of technologies to enhance his classes including clickers, on-line homework/tutorial systems, and podcasting. He is currently examining ways in which to make his classes of 300+ more active and student-centered.