Walker’s work in the Center for Educational Innovation focuses on investigating the impact of digital technologies and other educational innovations on teaching and learning in higher education. In collaboration with CEI and faculty colleagues, he has conducted studies of the effectiveness of new, technology-enhanced classroom spaces; the role of gender in science classroom participation and course performance; flipped and blended-format classes; multimedia and mobile technologies; classes delivered as MOOCs; and the social context of teaching and learning. He is co-author of the 2016 book A Guide to Teaching in the Active Learning Classroom (Stylus, 2016). His background is in philosophy, in which he earned a PhD from the University of North Carolina at Chapel Hill in 1996, and which he taught as a faculty member at the University of Minnesota - Duluth, The University of Pennsylvania, and Franklin and Marshall College. He earned a Master's degree in Quantitative Methods in Education from the Department of Educational Psychology at the University of Minnesota in 2010.