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Doob, American Mathematical Society (2007-13) Jeffrey-Williams, Canadian Mathematical Society (2007-8) Coxeter-James, Canadian Mathematical Society (2005-7) Kreiger-Nelson, Canadian Mathematical Society (2005-7) Cole, American Mathematical Society (2005) Fields/CRM (2004), Ribenboim (2004, 2006) Putnam Prize, questions committee, Mathematical Association of America (1999-2002) Chair 2001-2002. Creative Research Medal, University of Georgia, 1997, 1998 (chair), 2001. | ||||||||||||||||||||||||||||||||||||||||||||||||||