A great loss to our community.
I never met John personally, but his work (with Drs. Harald Strauss and Jay Kaufman, 1999 Chem Geol) on carbon isotopes in marine organic matters inspired me to disentangle the embedded information about sulfur isotope fractionation, and I continue working on this subject.
Department of Geology
University of Maryland College Park
College Park, Maryland 20742 USA