"Visualizing the hypercube: folding and slicing",
Hudson River Undergraduate Mathematics Conference, Skidmore College, 24 April 2001."Creating the Virtual Gallery 'Surfaces Beyond the Third Dimension'", invited presentation
Conference on Multimedia Tools for Communicating Mathematics,
CMAF/Universidade de Lisboa, Lisbon, Portugal, 23 November 2000."The Cube and the Hypercube: Rotations and Slices", invited lecture
Opening lecture for Para Além da Terceira Dimencão,
Madeira Tecnopolo, Funchal, Portugal, 22 November 2000."Research on the Internet: Past, Present and Future", invited lecture
Teaching and Learning with Technology Series, Union College, 20 Octboer 1999."An Unexpected Polyhedron: Geometry on the Internet", invited lecture
Mathematics Colloquium, Brown University, 24 September 1999."To the Fourth Dimension and Beyond!",
Parent's Day, Union College, 8 May 1999."Some new tight immersions of surfaces in threespace",
Math Department Research Seminar, Union College, 11 November 1998."Some new tight immersions of surfaces in threespace", invited lecture,
Topology Seminar, University of Rochester, 6 November 1998."The hypercube and the threesphere", invited lecture,
Student Colloquium, University of Rochester, 6 November 1998."Mathematics on the internet: looking back and looking forward", invited lecture,
Sectional Meeting of the AMS, Kansas State University, 27 March 1998."Vertexminimal immersions of simplicial surfaces into threespace", invited lecture,
Topology Seminar, SUNY Albany, 6 March 1998."The future of mathematics on the internet: an historical perspective", invited lecture,
Joint Teaching Seminar and Colloquium, SUNY Albany, 4 March 1998."Mathematics on the web: looking back and looking forward", invited lecture,
Northeastern sectional MAA fall meeting, Western New England College, 21 November 1997."Polyhedra, the fourth dimension and art: mathematics on the Internet", invited lecture,
Student Colloquium, The University of the South, 31 October 1997."Mathematics on the Web, looking back and looking forward", invited lecture
Conference on Electronic Communication of Mathematics, The Geometry Center, University of Minnesota, 31 May 1997."An unusual polyhedral object: mathematics on the internet", invited lecture
Eastern Pennsylvania and Delaware MAA sectional meeting, Ursinus College, 19 April 1997."The hypercube and the threesphere"
Colloquium Talk, Swarthmore College, 27 February 1997."Gutenberg today: communicating mathematics in an electronic age"
Senior Math Colloquium, Union College, 6 November 1996."Vertex minimal immersions of surfaces into threespace"
Math Department Research Seminar, Union College, 28 October 1996."A surprising tight polyhedral immersion: mathematics on the web", invited lecture
Workshop on Software and Mathematical Visualization, DIMACS, Princeton, NJ, 28 June 1996."Using computerbased labs in multivariable calculus", invited lecture
Workshop on Software and Mathematical Visualization, DIMACS, Princeton, NJ, 27 June 1996."A surprising tight polyhedral immersion: mathematics on the web", invited lecture
Visualizing Geometry conference, Rutgers University, Camden, March 1996."The hypercube and the threesphere", job interview talk
Trinity College, 5 February 1996; Dickinson College, 12 February 1996; Macalester College, 20 February 1996; Union College, 23 February 1996"A tight polyhedral immersion of the real projective plane with one handle",
Joint Meetings of the AMSMAA, Orlando, FL, January 1996."Gutenberg today: communicating mathematics in an electronic age", invited lecture
Mathematics Colloquium, St. Olaf College, 19 October 1995."A surprising tight polyhedral immersion", invited lecture
Meetings of the Clavius Group, University of Notre Dame, 13 July 1995."The National Science and Technology Center for the Computation of Geometric Structures: a postdoc's perspective", invited lecture
Texas Geometry and Topology Conference, Texas A & M, 12 November 1994."Tight immersions of simplicial surfaces into threespace",
Geometric Analysis seminar, University of Minnesota, 14 January 1994."Vertexminimal immersions of simplicial surfaces into threespace",
Geometric Analysis seminar, University of Minnesota, 7 January 1994."Vertexminimal immersions of the Klein bottle into threespace",
Joint meetings of the AMSMAA, San Antonio, CA, 15 January 1993.

