2. Member of the Subcommittee on Undergraduate Research of the CUPM in the Mathematical Association of America, 1991-1994.
3. Organizer of special session on Hyperbolic 3-Manifolds at the AMS Meetings in Amherst, Oct., 1990, and co-organizer of special session on Hyperbolic 3-Manifolds with Ara Basmajian at AMS Meetings in Dayton, Ohio in Oct., 1992.
4. Co-organizer of the research segment of the Research Geometry Institute at Smith in summer of 1993.
5. Director of SMALL program, involving 24 students and 7 faculty during summers at Williams, supported by NSF and other sources, 1990, 1991, 1992, 1993, 1996. Faculty group leader in summers of 1988,1990, 1991, 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001.
6. Referee for various journals, reviewer for NSF grant applications and reviewer for Mathematical Reviews.
7. Mathematical Association of America Visiting Lecturer, 1993-1997.
8. Mathematical Association of America member of the Committee on the Carl B. Allendoerfer Awards, Jan. 1993-1996, chair for 1995-96.
9. Co-organizer for the Hudson River Undergraduate Mathematics Conference, 1995, 1996.
10. Co-organizer of Catskills Taconic Topology Day, May 10, 1997.
11. Member of the Subcommittee on Undergraduate Research of the CUPM in the Mathematical Association of America, 1998-2001.
12. Member of the MAA program committee for Mathfest 1999.
13. Project NExT consultant, 1998-2000.
14. Member of the Haimo Distinguished Teaching Award Committee 2000-2002.
15. Member of the editorial board for the Anneli Lax Library of the MAA, 2001-2003.
16 . Co-organizer of special session on Topology and Cosmology held at the AMS Meetings in Williamstown, Oct., 2001.
17. Chair of the CUPM Subcommittee on Research by Undergraduates, Mathematical Association of America, 2001-2004.
18. Review of Hamilton College Mathematics Department, April 22-24, 2001.
19. Elected to the Council of the American Mathematical Society, 2002-2004.