He received his Diplom (M.Sc.) in physics from the Universitaet Hannover, Germany, and his Ph.D. in physics from Michigan State University. His research focuses on the use of technology for teaching and learning physics at the undergraduate level, as well as the influence of student epistemology on learning. He is also the Director of the LON-CAPA Project, http://www.lon-capa.org/, which was established in 1999 and links over 140 high schools, colleges, and universities. LON-CAPA maintains a shared educational content pool with over 400,000 online educational resources, including over 180,000 online homework problems, in mostly science and math. Through a spin-off company, LON-CAPA maintains online libraries of commercial textbook publishers, http://www.educog.com/publisher.html.