83. Invited Lecture, Maine-Quebec Number Theory Conference, University of Maine, Orono ME, October 2009.
82. Invited Lectures, Winter School on Explicit Methods for Diophantine Equations, Debrecen, Hungary, January 2009.
81. Invited Lecture, Australia-New Zealand Mathematics Convention, Christchurch, NZ, December 2008.
80. Invited Lecture, Maine-Quebec Number Theory Conference, Quebec City, October 2008.
79. Invited Special Presentation, France-Canada Joint CMS Meeting, Montreal, June 2008.
78. Departmental Colloquium, University of Calgary, March 2008.
77. Plenary Speaker, Diophantine Analysis and Related Fields, Kyoto, Japan, March 2008.
76. Departmental Colloquium, University of British Columbia, February 2008.
75. Departmental Colloquium, Simon Fraser University, February 2008.
74. Departmental Colloquium, University of Waterloo, January 2008.
73. Number Theory Seminar, Dalhousie University, January 2008.
72. Departmental Colloquium, Dalhousie University, January 2008.
71. Departmental Colloquium, Washington and Lee University, November 2007.
70. Invited Lecture, Lorentz Center, Leiden University, The Netherlands, May 2007.
69. Invited Lecture, AMS Sectional Meeting, Hoboken, New Jersey, April 2007.
68. Invited Lecture, AMS Sectional Meeting, Salt Lake City, Utah, October 2006.
67. Invited Lecture, 10th Meeting of the Canadian Number Theory Association, Vancouver, July 2006.
66. Invited Lecture, CMS Summer Meeting (special session in honour of R.K. Guy), Calgary, June 2006.
65. Invited Lecture, University of Waikato, Hamilton, New Zealand, March 2006.
64. Invited Lecture, Maine-Quebec Number Theory Conference, Orono, Maine, October 2005.
63. Invited Lecture, Czech-Slovak Number Theory Conference, Malenovice, Czech Republic, September 2005.
62. Invited Lecture, SERMON 2005, Columbia, South Carolina, April 2005.
61. Departmental Colloquium, Florida Atlantic University, Boca Raton, Florida, February 2005.
60. Invited Lecture, CMS Winter Meeting, Montreal, December 2004.
59. Invited Lecture, Number Theoretic Algorithms and Related Topics, Strobl, Austria, September 2004.
58. Invited Lecture, 8th Meeting of the Canadian Number Theory Association, University of Toronto, June 2004.
57. Invited Lecture, University of Strasbourg, Strasbourg, France, May 2004.
56. Departmental Colloquium, University of Calgary, Calgary, February 2004.
55. Departmental Colloquium, UNAM, Morelia, Mexico, February 2004.
54. CMS Winter Meeting, Vancouver, December 2003. Special Session on Number Theory.
53. CICMA, Number Theory Seminar, November 2003.
52. University of Ottawa, Colloquium, October 2003.
51. University of St Andrews, Colloquium, October 2003.
50. University of Edinburgh, Number Theory Seminar, October 2003.
49. AMS Sectional Meeting, Bloomington, Indiana, April 4-6, 2003. Special Session on Computational and Algorithmic Number Theory.
48 Macquarie University, Sydney, Number Theory Seminar, December 2002.
47. RIMS Institute Workshop on Diophantine Analysis, Kyoto, October 2002.
46. Universite de Brest, Number Theory Seminar, September 2002.
45. Universite de Paris VII, Number Theory Seminar, September 2002.
44. Fibonacci Association Conference, Northern Arizona University, July 2002.
43. Canadian Mathematical Society Summer Meeting, Universite de Laval, June 2002 (Special Session on Cryptography).
42. Canadian Mathematical Society Summer Meeting, Universite de Laval, June 2002 (Special Session on Number Theory).
41. University of British Columbia Number Theory Seminar, March 2002.
40. University of Calgary Number Theory Seminar, March 2002.
39. Meeting on Effective Methods for Solving Diophantine Equations, Debrecen, Hungary Oct. 22-26, 2001.
38. Universite de Laval, Departmental Colloquium, January 2001.
37. Five Colleges Number Theory Seminar, U. Mass Amherst, November 2000.
36. Workshop on Number Theory and Cryptography, Polish Academy of Sciences, Warsaw, Poland, September 2000.
35. Math2000/CMS Summer Meeting 2000, McMaster University, June 2000.
34. Millennial Conference on Number Theory, University of Illinois, May 2000.
33. Conference on Diophantine Problems and Transcendance, University of Illinois, May 27-28, 2000.
32. IMPA, Rio de Janeiro, Brazil, Colloquium, April 18, 2000.
31. University of Arizona (Tempe), Departmental Colloquium, March 24, 2000.
30. University of Ottawa, Number Theory Seminar, March 3, 2000.
29. Carleton University, Departmental Colloquium, January 24th, 2000.
28. University of Ottawa, Number Theory Seminar, January 7, 2000.
27. Mathematical Institute, Kossuth Lajos Technical University, Debrecen, Hungary, Number Theory Colloquium, Sept. 16, 1999.
26. 14th Czech and Slovak Number Theory Conference, Liptovsky Jan, Slovakia, Sept. 7, 1999.
25. Fields Institute, Industrial Seminar, May 14, 1999.
24. American Mathematical Society Sectional Meeting, Las Vegas, April 10, 1999.
23. University of Calgary, Departmental Colloquium, April 1, 1999.
22. University of Wollongong, Departmental Seminar, March 1, 1999.
21. University of Tasmania, Departmental Colloquium, February 24, 1999.
20. Macquarie University, Departmental Colloquium, February 21, 1999.
19. Macquarie University, Number Theory Seminar, February 21, 1999.
18. Australian National University, Departmental Colloquium, February 18, 1999.
17. Canterbury University, Departmental Colloquium, January 21, 1999.
16. CATS 1999 Plenary Lecture on The Mathematics of Public-Key Cryptography, Auckland, New Zealand, January 18, 1999.
15. Carleton University, Departmental Colloquium, January 8, 1999.
14. Canadian Mathematical Society Winter Meeting, Queen's University, Kingston, Ontario, December 1998.
13. Carleton University, Number Theory Seminar, November 9, 1998.
12. Simon Fraser University, October 22, 1998. Departmental Colloquium.
11. University of British Columbia, October 21, 1998, Number Theory Seminar.
10. January 1998, Halifax, NS. Departmental Colloquium.
9. July 1997, Zakopane, Poland (Given at the conference in honour of A. Schinzel.)
8. April 1997, Boulder, Colorado, Number Theory Seminar.
7. February 1997, Waterloo, Canada, Combinatorics and Optimization Seminar.
6. June 1995, Florida Institute of Technology, Departmental Colloquium.
5. May 1995, University of Waterloo, Waterloo, Ontario, Number Theory Seminar.
4. February 1995, University of Western Ontario, Departmental Colloquium.
3. September 1994, Butler University, Indiana, Indianapolis, USA (Given as part of J. James Woods Lecture Series)
2. February 1994, Macquarie University, Sydney, Australia, Departmental Colloquium.
1. January 1994, Dalhousie University, Halifax, Canada, Departmental Colloquium.