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Prior to joining the Laboratory, John was the Executive Director of MVA Inc., a privately held company that specializes in materials science consulting and research for industry and the federal government. Since 1996, he has also held the position of Adjunct Professor in the School of Materials Science and Engineering at Georgia Institute of Technology. He was a Senior Research Scientist with McCrone Associates in Chicago ('83-'92) and conducted his postdoctoral research in the Department of Astronomy at the University of Washington in Seattle ('82).
John earned a Ph.D. in chemistry from Arizona State University in 1982 and a B.S. in chemistry from the University of Canterbury, Christchurch, New Zealand, in 1976. He is a member of the American Association for the Advancement of Science, Fellow of the Meteoritical Society and Microbeam Analysis Society.