- Introduction to Graph Theory, workshop at OURFA2M2 conference, Dec 5, 2021. (Video available, let me know if you're interested in a crash course in graph theory.)
- Combinatorial Interpretations of Generalized Central Factorial and Genocchi Numbers, Joint Math Meetings, Jan 9, 2016.
- A New Combinatorial Interpretation of Generalized Genocchi Numbers, Joint Math Meetings, Jan 16, 2014.
- What kind of number is ...?, March 13, 2007.
- Writing in Mathematics - II, part of the G.I.F.T.S. session in Wakonse-Arizona workshop, May 19, 2006.
- Writing in Mathematics - I, part of the G.I.F.T.S. session in Wakonse-Arizona workshop, May 19, 2006.
- Securing Data Transmission Using Coding Theory, Math Awareness Week, April 11, 2006.
- RSA: A public-key cryptosystem, Entry Level Mathematics Colloquium, University of Arizona, April 5, 2005.
- Cryptography and Cryptanalysis, Entry Level Mathematics Colloquium, University of Arizona, December 9, 2003.
- More coming