What type of details about harrison brown can be gathered from the following bio? Bio: harrison scott brown -lrb- september 26 , 1917 -- december 8 , 1986 -rrb- was an american nuclear chemist and geochemist . he was a political activist , who lectured and wrote on the issues of arms limitation , natural resources and world hunger . during world war ii , brown worked at the manhattan project 's metallurgical laboratory and clinton engineer works , where he worked on ways to separate plutonium from uranium . the techniques he helped develop were used at the hanford site to produce the plutonium used in the fat man bomb dropped on nagasaki . after the war he lectured on the dangers of nuclear weapons . after the war , he worked at the university of chicago , where he pioneered nuclear geochemistry . the study of meteorites by brown and his students led to the first close approximation of the age of the earth and the solar system . between 1951 and 1977 , he worked at the california institute of technology -lrb- caltech -rrb- where he contributed to advancements in telescopic instrumentation , jet propulsion , and infrared astronomy .
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