38th Southeastern Conference, 2007 (photo by Jeff Locke) |

2018: *Conference on Combinatorics and its Applications* in celebration of Charlie Colbourn's 65th birthday, Singapore.
“New constructions of difference matrices”.

2017: *IPM Combinatorics and Computing Conference 2017*, Tehran, Iran.
“A strong external difference family with more than two subsets”.

2016: *Network Coding and Designs*, Dubrovnik, Croatia.
“How many mutually unbiased bases can exist in complex space of dimension *d*?”

2015: *39th Australasian Conference on Combinatorial Mathematics and
Combinatorial Computing*, Brisbane, Australia.
“2048 ideas for turning combinatorial research into a game”.

2015: *ALCOMA 15 — Algebraic Combinatorics and Applications*,
Banz, Germany.
“Constructions of complex equiangular lines”.

2014: *Workshop on Algebraic Design Theory and Hadamard Matrices*,
Lethbridge, AB.
“Hadamard matrices and complex equiangular lines”.

2014: *Combinatorics 2014*,
Gaeta, Italy. “A survey of complex equiangular lines”.

2013: *International Workshop on Finite Fields Constructions of
Combinatorial Arrays*,
Florianópolis, Brazil. “The structure of Costas arrays”.

2011: *13th IMA International Conference on Cryptography and Coding*,
Oxford, United Kingdom. “Emerging methods in the analysis of aperiodic
autocorrelations”.

2011: *Algebraic Combinatorics: in memory of Bob Liebler*,
Fort Collins, CO. “Emerging methods in the analysis of aperiodic
autocorrelations”.

2011: *Finite Geometries 3rd Irsee Conference*,
Irsee, Germany. “The asymptotic merit factor of binary sequences”.

2009: *2009 Colloquium on Combinatorics*, Magdeburg, Germany.
“A survey of Golay complementary sequences”.

2009: *6th Prairie Discrete Mathematics Workshop*, Kelowna, BC.
“New constructions of Golay complementary sequences”.

2009: *6th International Workshop on Coding and Cryptography*,
Lofthus, Norway.
“New constructions of Golay complementary sequences”.

2007: *14th Canadian Undergraduate Mathematics Conference*,
Vancouver, BC.
“Two summers of undergraduate research on the peak sidelobe level
problem”.

2007: *8th International Conference on Finite Fields and their
Applications*, Melbourne, Australia.
“What can be used instead of a Barker sequence”.

2007: *International Workshop on Combinatorics 2007*,
Yokohama and Kyoto, Japan.
“Golay complementary sequences: a multi-dimensional approach”.

2007: *38th Southeastern International Conference on Combinatorics,
Graph Theory, and Computing*, Boca Raton, FL.
“Written on a torus or on a cylinder? An elementary proof of the
Barker array conjecture”.

2007: *38th Southeastern International Conference on Combinatorics,
Graph Theory, and Computing*, Boca Raton, FL.
“Simplification through generalisation: Constructing and enumerating
Golay sequences via Golay arrays”.

2004: *Sequences and their Applications 2004*, Seoul, South Korea.
“A survey of the merit factor problem for binary sequences”.

2003: *Combinatorial Design Theory Research Workshop*,
DIMACS Connect Institute, Piscataway, NJ.
“Designing the IEEE 802.12 transmission code”.

2001: *Discrete Mathematics and its Industrial Applications*,
Capri, Italy.
“Combinatorial design theory and the IEEE 802.12 transmission code”.

1994: *24th Manitoba Conference on Combinatorial Mathematics and
Combinatorial Computing*, Winnipeg, MB.
“Recent results and open questions in difference sets”.

2017: Special Session on Finite Algebraic Combinatorics and Applications, *2nd Mathematical Congress of the Americas*,
Montreal, QB.
“Costas cubes”.

2017: Special Session on Theory and Application of Finite Fields, *2nd Mathematical Congress of the Americas*,
Montreal, QB.
“A strong external difference family with more than two subsets”.

2015: Public lecture to mark 150th birthday of Jacques Hadamard, University of Queensland, Brisbane, Australia. “What is a research mathematician?”

2015: *22nd Coast Combinatorics Conference*,
Kailua-Kona, HI. “Complex equiangular lines and combinatorial designs”.

2014: *Antalya Algebra Days XVI*, Antalya, Turkey.
“The structure of Costas arrays”.

2012: *RICAM Workshop on Finite Fields and Their Applications: Character Sums
and Polynomials*, Strobl, Austria.
“3-phase Golay sequence triads”.

2010: Presentation and panel discussion, *CMS Winter Meeting*,
Vancouver, BC. “The hiring process”.

2008: *Difference Sets Workshop*, Houston, TX.
“Beyond difference sets: aperiodic autocorrelation properties of
sequences and arrays”.

2007: Core Session on Finite Combinatorics,
*CMS-MITACS Joint Conference 2007*, Winnipeg, MB.
“Bounds on the growth rate of the peak sidelobe level of binary
sequences”.

2006: *Ottawa-Carleton Discrete Mathematics Workshop*,
Carleton University, ON.
“Written on a torus or on a cylinder? An elementary proof of the
Barker array conjecture”.

2006: Presentation and panel discussion, *PIMS Changing the Culture
2006: Teaching Mathematics for Understanding*, Simon Fraser University, BC.
“Obstacles to understanding”.

2006: Invited lecture to mark the initiation of a Ph.D. program in the Faculty of Science, University of Lethbridge, AB. “Written on a torus or on a cylinder? An elementary proof of the Barker array conjecture”.

2005: Special Session on Combinatorics, *CMS Winter Meeting*,
Victoria, BC.
“Proof of the Barker array conjecture”.

2003: Special Session on Combinatorics, *CMS Winter Meeting*,
Vancouver, BC.
“Constructing binary sequences with merit factor greater than 6.34”.

2002: Gaines public lecture, University of Richmond, VA. “ ‘Only a student would try that’: How to construct binary sequences with merit factor greater than 6.34”.

2002: Gaines public lecture, University of Richmond, VA. “Career planning for Math and Computer Science majors and minors”.

2002: *Combinatorial Potlatch*, University of Puget Sound, WA.
“Combinatorial design theory and the IEEE 802.12 transmission code”.

2001: *International Meeting on Finite Geometries*,
Oberwolfach, Germany.
“Designing the IEEE 802.12 transmission code”.

2001: *18th British Combinatorial Conference*, University of
Sussex, United Kingdom.
“Opportunities for combinatorics graduates in industry”.

2000: *MSRI Workshop on Emerging Applications of Combinatorial
Designs*, Berkeley, CA.
“Two applications of combinatorial design theory”.

2000: MSRI-Evans public lecture, *MSRI Workshop on Emerging
Applications of Combinatorial Designs*, University of California,
Berkeley, CA.
“Combinatorial design theory in an industrial research lab”.

2000: *Combinatorics Colloquium*, University of Reading,
United Kingdom.
“Combinatorics and digital communication”.

1998: *International Meeting on Designs and Codes*,
Oberwolfach, Germany.
“Golay complementary sequences and Reed-Muller codes: an unexpected
connection”.

1997: *Open University Colloquium on Combinatorial Designs and
their Applications*, Milton Keynes, United Kingdom.
“Recent developments in difference sets”.

1995: *R.C. Bose Memorial Conference on Statistical Design and
Related Combinatorics*, Fort Collins, CO.
“A recursive unifying construction for difference sets”.

1994: Special Session on Codes and Designs, *AMS Sectional Meeting*,
Richmond, VA.
“Incompatible difference set contractions”.

1992: Special Session on Measurements for Network Control, Planning and
Optimization, *2nd ORSA Telecommunications Conference*, Boca Raton, FL.
“Traffic estimation for the largest sources on a network,
using packet sampling with limited storage”.

1992: Special Session on Designs and Codes, *AMS Joint Mathematics
Meeting*, Baltimore, MD.
“There is no (324, 153, 72)-difference set in
ℤ_{2}^{2} × ℤ_{3}^{2} ×
ℤ_{9} or
ℤ_{4} × ℤ_{3}^{2} ×
ℤ_{9}”.

1997: *ETSI BRAN Working Group 3* (Hiperlan Type 2), London,
United Kingdom.
“Options for variable rate coding in OFDM using binary, quaternary
and octary modulation”.

1993: *IEEE 802.3 Higher Speed Study Group*, Boston, MA.
“100Base-VG packet format”.

1993: *IEEE 802.3 Higher Speed Study Group*, Baltimore, MD.
“IEEE 802 functional requirement”.

1993: *IEEE 802.3 Higher Speed Study Group*, Santa Clara, CA.
“Error detection in 100Base-VG”.