Dr. Christopher Hoadley is an assistant professor jointly appointed in the College of Education and the School of Information Sciences and Technology at Penn State University. Hoadley designs, builds, and studies ways for information technology to enhance thinking and learning. Currently his research focuses on collaborative technologies such as knowledge management tools and computer support for cooperative learning (CSCL). Other interests include design-based research methodologies, the use of design activities as a teaching method, and science and technology education at the elementary through postsecondary levels. Hoadley previously served as the president of the International Society of the Learning Sciences and is past president of the American Educational Research Association's SIG:EST (Special Interest Group on Education in Science and Technology). He also leads the Design-Based Research Collective, a group funded by the Spencer Foundation to explore the role of design-based research in education.