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2007: Public lecture, XXVth Journées Arithmétiques, Edinburgh 2007: Erdos memorial lecture, American Mathematical Society 2006: Jeffrey-Williams lecture, Canadian Mathematical Society 2006: Royal Society of Canada annual meeting, invited speaker 2004: "Current Events" speaker, American Mathematical Society, Phoenix 2003: Plenary speaker at Canadian Mathematical Society meeting, Vancouver. 2002: Plenary MAA speaker at the Annual Joint Meeting, San Diego. 1999: Ribenboim lecture, Canadian Number Theory Association, Winnipeg. 1996: Plenary AMS/MAA speaker at the Annual Joint Meeting, Orlando. 1994: Invited Speaker at the International Congress of Mathematicians, Zurich. | ||||||||||||||||||||||||||||||||||||||||||