Clayton Lewis is professor of Computer Science and Scientist in Residence at the Coleman Institute for Cognitive Disabilities at the University of Colorado. He is well known for his work (with students and colleagues) on evaluation methods in user interface design, including the thinking aloud and cognitive walkthrough methods. His recent work on technology for people with cognitive disabilities has been presented to the U.S. Access Board Technical Advisory Committee, CSUN, RESNA, ACM ASSETS, and other forums. He is a member of the CHI Academy, recognizing his contributions to Human Computer Interaction.