Louis Rosen Dies

Louis Rosen, 91, a physicist who helped build the first atom bomb and several years later informed Edward Teller that Teller's thermonuclear device had worked, died of a subdural hematoma Aug. 20 in Los Alamos, N.M.

Few scientists had longer or more productive careers than Dr. Rosen or were more deeply involved in the major issues of their discipline. During 65 years as a scientist and administrator at the Los Alamos laboratory where the atom bomb was designed and built, Dr. Rosen was known as an unassuming and much loved figure. He provided advice and guidance until days before his death.

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His wife, the former Mary Terry, died in 2004. Their son, Terry Rosen, died in 2003.

In addition his granddaughter, survivors include a grandson; four great-grandchildren; and a brother, Bernard, a longtime Washington area resident who recently moved to San Francisco.

Rest In Peace, Louis.