The Physics Education Research Group at Colorado (PER@C) is one of largest research programs in physics education research (PER) in the nation. Our research group develops and studies: uses of technology in physics education, assessments (conceptual, epistemological, and belief-oriented), theoretical models of students' learning physics, social and contextual foundations of student learning, examination of successful educational reforms and replication studies of such reforms, and student problem solving in physics. We sponsor a number of educational reforms in physics, which range from pre-college to faculty and institutional change. The research group includes faculty, staff, and students from both the Department of Physics and the School of Education.