Joachim Stöhr (born September 28, 1947) is a physicist and professor emeritus of the Photon Science Department of Stanford University. His research has focused on the development of X-ray and synchrotron radiation techniques and their applications in different scientific fields with emphasis on surface science and magnetism. During his career he also held several scientific leadership positions, such as the director of the Stanford Synchrotron Radiation Laboratory (SSRL) and he was the founding director of the Linac Coherent Light Source (LCLS), the world's first x-ray free electron laser.
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