2017:
 Some Unusual Dice and their Connections to Voting, Math Department Faculty Seminar, Union College, Schenectady, New York, 10 November 2017
2015:
 The Elegance of Line: Ruled Surfaces and the Dynamics of the Olivier Models, Math Department Student Seminar Seminar, Union College, Schenectady, New York, 30 September 2015
2014:
 MathJax as an OpenSource Project, Special Session on Open Source Resources for Mathematics, MathFest Conference, Portland, Oregon, 8 August 2014
2013:
 The Hypercube and Hypersphere: Breaking them Down and Building them Up, Math Department Student Seminar, Union College, Schenectady, New York, 24 September 2013
 MathJax from an Author's Point of View, Joint Math Meetings, San Diego, CA, 12 January 2013
 MathJax: The Past and the Future, SIGMAA on Mathematics Instruction Using the Web, Joint Math Meetings, San Diego, CA, 11 January 2013
2012:
 The Hypercube and Hypersphere: Breaking them Down and Building them Up, Leonard C. Sulski Memorial Lecture, College of the Holy Cross, Worchester, Massachusetts, 20 March 2012
 WeBWorK Projects: MathJax and MathObjects, Joint Math Meetings, Boston, Massachussets, 4 January 2012
2011:
 An Introduction to MathJax for the Technically Inclined, SageDays31, Seattle, Washington, 14 July 2011
2010:
 MathJax: a JavaScriptbased engine for including TEX and MathML in HTML, Joint Math Meetings, San Francisco, California, 15 January 2010
2009:
 Using Game Show Technology as a Teaching Aid, (with P. Neidermeyer), Clute Institute for Academic Research, Honolulu, Hawaii, 7 January 2009
2008:
 Voting with Rubber Bands and Pulleys (with William Zwicker), Siena College Mathematics Seminar Lecture, Siena College, Loudonville, NY, 21 November 2008
 Voting with Pulleys and Rubber Bands (with William Zwicker), Undergratuate Mathematics Seminar, Union College, Schenectady, NY, 7 October 2008
 Voting and the Geometry of Means and Medians (with William Zwicker), Math for America, Manhattan, New York, 20 September 2008
 Offsets, Inversions, and Evolutes: Taking Plane Ideas into Space, ArtMath MathArt Conference, SUNY Albany, Albany, New York, 26 April 2008
 Tight Surfaces in ThreeDimensional Compact Euclidean Space Forms, Math Department Research Seminar, Union College, 24 January 2008
2007:
 Putting Math on the Web: The jsMath Approach, Presentation to Faculty, Haverford College, 8 October 2007
 The Hypercube and Hypersphere: Breaking them Down and Building them Up, BiCollege Colloquium, Haverford College, 8 October 2007
 The Elegance of Line: Ruled Surfaces and the Dynamics of the Olivier Models, Math Department Student Seminar, Union College, 18 September 2007
 Beyond the Box: A Whirlwind Tour of the Hypercube, Sigma Xi Banquet, Union College, 23 May 2007
 Tight Surfaces in ThreeDimensional Compact Euclidean Space Forms, Topology Seminar, State University of New York at Albany, 30 April 2007
 WeBWorK at a Liberal Arts College: the Union Experience, Department of Mathematics, Lafayette College, 22 February 2007
2006:
 The Current State and Future of jsMath, Conference on the Evolution of Mathematical Communication in the Age of Digital Libraries, IMA, University of Minnesota, 8 December 2006
 The Good, the Bad, and the Ugly: Writing Problems Using WeBWorK's New Parser, Joint Meetings of the AMSMAA, Knoxville, TN, 12 August 2006
2005:
 Decomposing the FourDimensional Hypersphere, Conference on FourDimensional Worlds, IMBS, University of California at Irvine, 25 February 2005
 Decomposing the FourDimensional Hypersphere, Union College Student Seminar, 21 February 2005
2004:
 Tight Surfaces in ThreeDimensional Compact Euclidean Space Forms, University of Massachussetts at Amherst, 16 April 2004
 From Flatland to Spaceland and Beyond: Visualizing the FourDimensional Hypercube, Slippery Rock University, 1 April 2004
 WeBWorK Developments at Union College: New Problems, Answer Checkers and Graders for Multivariable Calculus, Joint Meetings of the AMSMAA, Pheonix, AZ, 9 January 2004
2003:
 Visualizing the FourDimensional Hypercube: Projections and Slices, HRUMC Conference, Union College, 12 April 2003
2002:
 Cubes and Hypercubes: Rotations and Slicing, Society of Hispanic Professional Engineers, Union College, 26 February 2002
2001:
 Mathematical Art: Visualization, Computer Graphics and the Internet, EE Seminar, Union College, 16 October 2001
 Interactive Demonstrations Using
StageTools
, Faculty Research Seminar, Union College, 17 May 2001 Visualizing the Hypercube: Folding and Slicing, HRUMC Conference, Skidmore College, 24 April 2001
2000:
 Creating the Virtual Gallery "Surfaces Beyond the Third Dimension", MTCM, Lisbon, Portugal, 23 November 2000
 Cubes and Hypercubes: Rotations and Slicing, Madeira, Portugal, 22 November 2000
1999:
 Teaching and Learning with Technology Series, Union College, 20 October 1999
 Mathematics Colloquium, Brown University, 24 September 1999
 Parent's Weekend, Union College, 8 June 1999
1998:
 AMS Sectional Meeting, Kansas State University, 27 March 1998
 Joint Teaching Seminar and Colloquium, SUNY Albany, 4 March 1998
1997:
 MAA Sectional Meeting, WNEC, 21 November 1997
 University of the South, 31 October 1997
 ECM Conference, 31 May 1997, Geometry Center
 EPADEL Meeting, 19 April 1997, Ursinus College
 Swarthmore College Colloquium, 27 Februady 1997
1996:
 Union College Math Colloquium, 6 November 1996
 DIMACS Visualizing Geometry, June 1996
 Visualizing Geometry, 1 March 1996, Rutgers
 The Hypercube and the 3Sphere given at:
 Trinity College, 5 February 1996
 Dickinson College, 12 February 1996
 Macalester College, 20 February 1996
 Union College, 23 February 1996
1995:
 SAMP Confernce, 13 December 1995
 St. Olaf College Colloquium, 19 October 1995
 EAB meeting, 26 April 1995
 MER conference, April 1995
Repeated:
