- Textbooks for the Web from MathBook XML, WEBSIGMAA Guest Lecture. Joint Mathematics Meeting, Atlanta, January 2017. [PDF]
- Open Source Textbooks and Software in Mathematics. Annual Meeting of the Texas Section of the Mathematical Association of America, Stephen F. Austin State University, Nacogdoches, Texas, April 2, 2016. [PDF]
- Open Source Textbooks and Software in Mathematics. Department of Mathematics and Statistics, University of the West Indies, Trinidad, March 2016. [PDF]
- A WeBWorK-MathBook XML Bridge. Joint Mathematics Meeting, Seattle, January 2016. [HTML]
- Open Source Mathematics with MathBook XML. University of Manitoba Mathematics Colloquium, Winnipeg, Manitoba, May 2015. [HTML]
- Authoring Open Source Mathematics Textbooks. Oregon Mathematical Association of Two-Year Colleges, Lincoln City, Oregon, April 2015. [HTML]
- Authoring Open Source Mathematics Textbooks. Annual Meeting of the Pacific Northwest Section of the Mathematical Association of America, University of Washington, Tacoma, April 2015. [HTML]
- MathBook XML. Sage Edu Days 6, University of Washington, Seattle. June 17, 2014. [HTML][PDF]
- Publishing Mathematics with XML. Sage Edu Days 5, University of Washington, Seattle. June 19, 2013. [PDF]
- A Modern Online Linear Algebra Textbook. 18th Conference of the International Linear Algebra Society, Providence, Rhode Island. June 7, 2013. [PDF]
- Kansas City Regional Mathematics Technology Expo, University of Missouri, Kansas City, October 5/6, 2012. Sage Worksheets [Keynote] [Workshop] Static Web Pages [Keynote] [Workshop]
- Open Mathematics Textbooks. WeBWork Developers Workshop, Winona, Minnesota. August 6, 2012. [PDF]
- Teaching an Introductory Linear Algebra Course. Project NExT Panel Discussion, MathFest, Madison, Wisconsin. August 1, 2012. [PDF]
- Concrete Mathematics, Spiced with Sage. Guest Lecture, CS 582/482 (Prof. Frank Ruskey), University of Victoria, British Columbia. May 2012. Sage Worksheets [One] [Two] Static Web Pages [One] [Two]
- Some overview of Sage and its use in teaching linear algebra, abstract algebra and graph theory with open textbooks. Invited Lecture, Korean Mathematical Society Spring Meeting, Seoul, South Korea. April 2012. [Presentation (Sage Worksheet)] [Static PDF]
- Sage: Ultimate tool for math research and teaching. Sage Days 37, Korean Mathematical Society Spring Meeting, Seoul, South Korea. April 2012. [Presentation (Sage Worksheet)] [Static PDF]
- A HOWTO on Producing and Promoting an Open Source Mathematics Textbook. Annual Meeting of the Pacific Northwest Section of the Mathematical Association of America, University of Portland, April 2012. [PDF]
- Adding Spice to Your Research with Sage: Open Source Software for Mathematics. Perimeter Institute for Theoretical Physics, Waterloo, Canada, May 2011. [Video and Slides] [Presentation (Sage Worksheet)] [Static PDF]
- Spicing Up Your Research in Combinatorics with Sage. 14th Coast Combinatorics Conference, University of Victoria, British Columbia, February 2011. [Presentation (Sage Worksheet)] [Static PDF]
- Building Science in Africa. University of Puget Sound Thompson Hall Science and Mathematics Seminar, January 2011.
- A First-Year Seminar in Cryptology. Joint Mathematics Meetings, New Orleans, January 2011. [PDF]
- UTMOST: Undergraduate Teaching of Mathematics with Open Software and Textbooks (Poster Presentation). Joint Mathematics Meetings, New Orleans, January 2011. [PDF]
- Solving Sudoku with Dancing Links. African Institute for Mathematical Sciences, Cape Town, South Africa, October 2010. [PDF]
- Solving Sudoku with Dancing Links. Stellenbosch University, South Africa, October 2010. [PDF]
- Open Mathematics Textbooks. African Institute for Mathematical Sciences, Cape Town, South Africa, October 2010. [PDF]
- Textbooks as Sage Notebooks. Joint Mathematics Meetings, San Francisco, January 2010. [PDF] [Sage Demo Worksheet]
- Using Sage to Teach Group Theory. Sage Edu Days 1, Clay Mathematics Institute, Cambridge, MA, December 2009. [PDF] [Video]
- Open Textbooks: An Author's Perspective. Washington State Board for Community and Technical Colleges Webinar, November 2009. [PDF] [Replay]
- Introduction to Algebraic Graph Theory. Santa Clara University Pi Mu Epsilon Mathematics Seminar, Santa Clara, California, November 2009. [PDF]
- Open Textbooks: An Author's Perspective. Sustainable Scholarship Conference, Pacific University, Forest Grove, Oregon, October 2009. [PDF]
- Introduction to Algebraic Graph Theory. Pacific University Mathematics Seminar, Forest Grove, Oregon, October 2009. [PDF]
- Introduction to Algebraic Graph Theory. Reed College Mathematics Seminar, Portland, October 2009. [PDF]
- Everything You Wanted to Know About the Hoffman-Singleton Graph, But Were Afraid to Draw. Invited Paper Session, MAA Summer Meeting, Portland, August 2009. [PDF] [Movie 1] [Movie 2]
- Open Textbooks. Project NExT Workshop, Portland, August 2009. [PDF]
- Authoring Interactive Worksheets. Sage Days 15, University of Washington, Seattle, May 2009. [PDF] [Video]
- Linear Algebra Tutorial. Sage Days 15, University of Washington, Seattle, May 2009. [PDF] [Video]
- A First Course in Linear Algebra: An Open-Source Textbook. Sage Developer Days 1, University of Washington, Seattle, June 2008. [PDF]
- Introduction to Algebraic Graph Theory. Pacific Lutheran University Mathematics Seminar, Tacoma, April 2007. [PDF]
- Counting Subgraphs in Regular Graphs. New Trends in Discrete Mathematics, University of Washington Tacoma, October 2006. [PDF]
- Cheats, Liars, Posers and Thieves: Cryptographic Protocols for Insecure Networks. Digipen Institute of Technology, Redmond, April 2006. [PDF]
- Platonic Solids from Paper Plates. Pacific Lutheran University Mathematics Seminar, Tacoma, November 2005.
- Platonic Solids from Paper Plates. University of Puget Sound Department of Mathematics and Computer Science Seminar, Tacoma, February 2005.
- Counting Subgraphs in Regular Graphs. Mathematics Department Seminar, University of the West Indies, Trinidad, March 2003. [PDF]
- Secrecy and Trust via Applications of Cryptography. Mathematics Department Seminar, University of the West Indies, Trinidad, March 2003. [PDF]
- Advice for Map Makers, Traveling Salesmen, and Party Planners. Thirty-First Regester Lecture, University of Puget Sound, Tacoma, November 2003.
- Uniquely 4-colorable planar graphs. University of Puget Sound Department of Mathematics and Computer Science Seminar, April 2000.
- The girth of a graph. Workshop on Graphs and Designs, University of Hawaii at Manoa, August 1999.
- Counting Subgraphs in a Regular Graph. University of Western Australia Mathematics Seminar, October 1997.
- Counting Subgraphs in a Regular Graph. Curtin University Combinatorics Day, October 1997.
- Counting Configurations in Designs. University of Western Australia Combinatorial Computing Seminar, September 1997.
- Counting Configurations in Designs. 16th British Combinatorial Conference, London, July 1997.
- The Art and Science of Cryptology. University of Puget Sound Daedalus Dinner, March 1997.
- Electronic Commerce and Digital Cash. University of Puget Sound Science and Mathematics Seminar, January 1997.
- Secrecy and Trust. University of Puget Sound Science and Mathematics Seminar, February 1995.
- Secrecy and Trust via Applications of Cryptography. Seattle University Computer Science Seminar, November 1994.
- Counting Subgraphs of Regular Graphs. Southeastern Conference on Graph Theory, Combinatorics and Computing, March 1994.
- Pure Carbon, Pure Mathematics. University of Puget Sound Science and Mathematics Seminar, 1994.
- Why Would a Mathematician Use a Computer? University of Puget Sound Science and Mathematics Seminar, April 1992.
- Counting Subgraphs of Regular Graphs. University of Illinois Combinatorics Seminar, March 1992.
- How Many 24-dimensional Balls Fit in a 24-dimensional Box? University of the West Indies Mathematics Seminar, March 1991.
- Distance Polynomial Graphs. Sixth Caribbean Conference on Combinatorics and Computing, January 1991.
- Highly Regular Graphs. University of Washington Geometry and Combinatorics Seminar, 1990.
- Trees with Very Few Eigenvalues. AMS Annual Meeting, Phoenix, January 1990.
- Feasibility Conditions for Highly Regular Graphs. Pacific Lutheran University Mathematics Seminar, March 1988.
- Graph Theory and Chemistry. University of Puget Sound Science and Mathematics Seminar, 1985.
- Orbit Polynomial Graphs. AMS Annual Meeting, Louisville, January 1984.