!!Kai M. Siegbahn
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Kai Siegbahn, Nobel Laureate Physics 1981 "for his contribution to the development of high-resolution electron spectroscopy", died on July 20, 2007.
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Obituary in [The New York Times|http://www.nytimes.com/2007/08/07/world/europe/07siegbahn.html?_r=1&ex=1187409600&en=219e50bdb856e984&ei=5070].
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Kai M. Siegbahn was the son of Karl Manne Georg Siegbahn (3 December 1886 - 26 September 1978) who was a Swedish physicist, and Nobel Laureate in Physics 1924 for his discoveries and research in the field of X-ray spectroscopy.