Richter, 67, will remain on the faculty at Stanford University and will be the next president of the International Union of Pure and Applied Physics. Richter's main achievements at SLAC have been the construction of the two-mile Stanford Linear Collider (SLC), the world's first linear collider, and the Stanford B-factory. Work on the SLC began in 1983 and physics experiments started in 1989. Experiments on the B-factory, another electron-positron collider, will start next year. Richter will also leave SLAC with strong programmes on synchrotron radiation and accelerator-based X-ray sources, and R&D for the next linear collider.