It is an honor and a pleasure to introduce Charles T. Prewitt as recipient of the Mineralogical Society of Americas highest honor, the Roebling Medal. Mineralogist, crystallographer, solid state chemist, organizer, leader, mentor, educator, colleague, friend—he excels in both professional and human attributes. Most of you know Charlie. Those few who do not know him know the Shannon and Prewitt tables of radii. But do you know that those were created not by university professors but by industrial scientists? Charlie Prewitts career has had several stages: Ph.D. at MIT, years in the DuPont Central Research Laboratory in Delaware, followed by...

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