Originally trained as a physicist, he is now a historian of science.
He then did postdoctoral studies at the Hale Observatories and California Institute of Technology, publishing papers on solar physics; from 1971 to 1974 he studied history of science in the University of California, Berkeley.
He conducted oral history interviews of many physical scientists, particularly astrophysicists such as Subrahmanyan Chandrasekhar (1977)[2] and climate scientists such as Wallace Broecker (1997).
[3] He has produced numerous historical articles and two children's science books and written or co-edited eleven other books,[4] including the following: While at AIP he also produced and edited an award-winning website with historical exhibits.
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