| Mar. 17–21, 2008 | Groups and Computation, Columbus, Ohio |
| Apr. 11, 2008 | CCSCNE 2008, Staten Island, N.Y. |
| Oct. 4, 2008 | ACM Programming Contest, Springfield, Mass. |
| Aug. 20–31, 2007 | Nihon University, Tôkyô |
| Oct. 15, 2007 | Boston College, Chestnut Hill, Mass. |
| Nov. 9, 2007 | Boston University, Boston |
| Nov. 28–30, 2007 | University of Oregon, Eugene |
| Jan. 14, 2006 | Tôkyô Institute of Technology, Tôkyô |
| Apr. 21, 2006 | CCSCNE 2006, Worcester, Mass. |
| June 10, 2006 | University of Oregon, Eugene |
| July 24–26, 2006 | MACIS 2006, Beijing |
| Dec. 1, 2006 | NSF CPATH, Newark |
| June 12–15, 2005 | CCC 2005, San José |
| Oct. 29, 2005 | ACM Programming Contest, Springfield, Mass. |
| Apr. 23, 24, 2004 | CCSCNE 2004, Schenectady, N.Y. |
| May 14, 2004 | The Columbia | NYU | IBM Research Theory Day, Morningside Heights, N.Y. |
| June 21–24, 2004 | CCC 2004, Amherst, Mass. |
| July 9, 2004 | Boston College, Chestnut Hill, Mass. |
| Sept. 1–Dec. 31, 2004 | Northeastern University, Boston |
| Sept. 4–9, 2004 | Finite Geometries, Groups and Computation, Pingree Park, Colo. |
| Jan. 8, 2003 | Nagoya University, Nagoya |
| Jan. 10, 2003 | Nihon University, Tôkyô |
| Mar. 24–28, 2003 | Groups and Computation, Columbus, Ohio |
| Oct. 11–14, 2003 | FOCS 2003, Cambridge, Mass. |
| Oct. 25, 2003 | ACM Programming Contest, Springfield, Mass. |
| Jan. 8, 9, 2002 | Kyûshû University, Fukuoka |
| Jan. 10, 2002 | Kyôto University, Kyôto |
| Mar. 1, 2002 | Boston University, Boston |
| Mar. 13, 2002 | CSF 2002, Hamden, Conn. |
| Apr. 19, 2002 | CCSCNE 2002, Worcester, Mass. |
| May 31, 2002 | University of Oregon, Eugene |
| July 7–10, 2002 | ISSAC 2002, Villeneuve d'Ascq |
| July 12, 2002 | Queen Mary, University of London, London |
| Sept. 8, 2002 | CP 2002, Ithaca, N.Y. |
| Oct. 19, 2002 | ACM Programming Contest, Springfield, Mass. |
| Nov. 7, 2002 | Boston University, Boston |
| Oct. 13, 2001 | ACM Programming Contest, Springfield, Mass. |
| Oct. 17, 2001 | Northeastern University, Boston |
| Oct. 19, 2001 | Massachusetts Institute of Technology, Cambridge, Mass. |
| Nov. 8, 2001 | Northeastern University, Boston |
| Dec. 13, 2001 | Northeastern University, Boston |
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