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2007: Erdos memorial lecture, American Mathematical Society, Davidson, NC.
2006: Jeffrey-Williams lecture, Canadian Mathematical Society, Toronto.
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.
1993: XXVI National Congress of the Sociedad Matematica Mexicana,
Morelia, Mexico
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