His research examines behavioral determinants of response variability, choice, and independent social skills in children with autism. He also writes about conceptual issues relating to the ethical and professional behavior of practicing behavior analysts. He is on the editorial boards of The Analysis of Verbal Behavior, Behavior and Philosophy, the Review Journal of Autism and Developmental Disorders, and the Journal of Developmental and Physical Disabilities. Through workshops and consultation, he has established multiple school-based programs for children with autism, and he has provided training to teachers, related service providers, and behavior analysts both nationally and internationally.