Foreign member of the Finnish Academy of Science and Letters (elected 2020)
Authored or co-authored several books, including: 'Automatic Sequences: Theory, Applications, Generalizations' (2003), 'A Second Course in Formal Languages and Automata Theory' (2008), 'Neverending Fractions' (with Jon Borwein et al.), and 'Algorithmic Number Theory' (1996)
Co-editor of 'The Role of Theory in Computer Science: Essays Dedicated to Janusz Brzozowski' (2017)
Two integer sequences are named after him—one introduced by D. Boyd and another family defined by Moree et al.
A mathematical constant (~1.369451...) is named after him
Developed 'Walnut', free software for solving problems in combinatorics on words and number theory
Miscellany
Runs a personal blog called 'Recursivity'
Participates in a Community Editorial Board
Enjoys photography; a photo of him was taken in the stairway of the Math & Computer building (MC) at the University of Waterloo on June 27, 2024
Maintains an 'Urban Legends Debunked' section
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