Areas of interest:
Combinatorics on words, formal languages and automata theory (especially connections with number theory), algorithmic number theory (primality testing, factoring, etc.), history of mathematics and computer science, ethical use of computers, debunking pseudoscience and pseudomathematics.

See my rating at ratemyprofessors.com.

Here I am on google scholar citations.

Are you interested in graduate study in theoretical computer science? Please read this.

Professional Activities The combinatorics on words wiki (send me e-mail to get an account to edit it) My new book, Neverending Fractions, co-written with Jon Borwein, Wadim Zudilin, and the late Alf van der Poorten (1943-2010) ACM Distinguished Scientist, 2008. A Second Course in Formal Languages and Automata Theory, Cambridge University Press, September 2008. Automatic Sequences: Theory, Applications, Generalizations, Cambridge University Press, July 2003. Algorithmic Number Theory published by MIT Press, August 1996. Editor-in-chief, Journal of Integer Sequences Center for Applied Cryptographic Research Courses taught by JOS CS 341, Fall 2018 Curriculum vitae of JOS (not updated since 2002, sorry!) Selected papers of JOS Recent talks by JOS Book reviews by JOS Published and unpublished essays by JOS Co-Authors of JOS Graduate students supervised by JOS Library catalogues Links to other CS and math-related sites This week's Math/CS talks at Waterloo Upcoming talks in our Algorithms and Complexity group CS Theory Event Aggregator

Unprofessional Activities My blog, Recursivity Family Friends Quotations Letters to the editor by JOS Community Editorial Board JOS's favorite animal My Elvis number Travel Photographs Other interesting web pages Urban Legends Debunked Today's weather in Kitchener-Waterloo

Disclaimer: Nothing on this page should be taken to represent the official views of the University of Waterloo.