My SIMS Odyssey began when I moved from Washington, D.C., to Paris, France, in 1974.

Looking back four decades to trace my personal history of involvement in the development of secondary ion mass spectrometry (SIMS) applications to the geosciences, I will try to weave a tapestry with the development of my own scientific interest in modern mantle geochemistry and the development of SIMS technology as crossing threads.

I finished my Ph.D. thesis at the University of Tokyo in 1968 on Pb isotopes in some Japanese granitic rocks and along the way developed a strong interest in studying trace element fractionation...

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