Since 1952, the department has had an initiative in high-energy physics, playing a major role in Korea. Currently, the High Energy Physics Group consists of six faculty members. Its experimental program involves two collider experiments, the Compact Muon Solenoid (CMS) and Belle. An intensive R&D program for the CMS muon trigger detectors and resistive plate chambers has been in progress since 1997. Theoretical efforts include collider phenomenology, with the main focus on understanding the effects of the strong interaction. With the Large Hadron Collider (LHC) at CERN currently running, both experimental and theoretical activities will focus on LHC physics and the heavy-ion collisions at RAON being built in Korea.