These are transparencies and/or videos
for some talks. They're in reverse chronological order.
You can see a lot of talk videos on my YouTube channel.

Cambridge University
Physics Society, October 3, 2018, and
Leverhulme Lecture at the International Centre for Mathematical
Sciences, November 27, 2022.

BLAST 2022, Chapman University, August 812, 2022,
organized by José GilFerez, Peter Jipsen, Alexander Kurz and
M. Andrew Moshier.

Applied Category Theory
2022, July 1822, 2022,
organized by Jules Hedges, Jade Master, Fredric Nordvall Forsberg and
James Fairbanks.

GReTA
Seminar, June 29, 2022.

Grothendieck's Approach to Mathematics, Chapman University, May 25, 2022,
organized by Chapman University, Peter Jipsen, Alexander Kurz,
Andrew Mosher, Marco Panza, Ahmed Sebbar and Daniele Struppa.

Categorical Semantics of Entropy, CUNY Grad Center, May 11, 2020,
organized by John Terilla.

Department of Mathematics, Ohio State University, November 5, 2020, and
Department of Mathematics, University of Denver, February 4, 2022.

Basic Research Community in Physics: Annual Symposium, November 5, 2021,
organized by Alexander Thomas.

Department of Physics and Astronomy,
University of British Columbia, September 23, 2021.

Perimeter Institute Colloquium,
September 15, 2021.

Finding the Right Abstractions Summit 2021, Topos Institute,
May 19, 2021,
organized by Scott Garrabrant, David Spivak, and Andrew Critch.

Octonions and the Standard Model, April 5, 2021,
organized by Latham Boyle and Kirill Krasnov.

Topos Institute Colloquium, March 25, 2021.

Zürich Theoretical Physics Colloquium — Sustainability Week,
March 8, 2021,
organized by Niklas Beisert and Anna Knörr, and
Department of Physics, Universidad de Santiago – August 10, 2021.

Yorkshire and Midlands Category Seminar, February 5, 2021,
organized by Simona Paoli, Nicola Gambino and Steve Vickers, and
The Berkeley Seminar,
Topos Institute, July 28, 2021.

Whittier College Math Club, November 20, 2020,
organized by Brandon Coya.

Quantum Field Theory Seminar, Mathematics Institute, University
of Oxford, March 4, 2014, and
Seminario de Categorías UNAM, October 7, 2020.

Applied Category Theory 2020,
July 7, 2020,
organized by Brendan Fong, David Myers, Paolo Perrone, and David Spivak.

MIT Categories Seminar,
April 9, 2020, Massachusetts Institute of Technology,
organized by Brendan Fong, Paulo Perrone and David Spivak.

ACT@UCR Seminar,
April 1, 2020, U.C. Riverside,
organized by John Baez, Joe Moeller and Christian Williams.

AMS Western Sectional Meeting,
November 910, 2019, U. C. Riverside,
organized by John Baez and Joe Moeller.

Category Theory 2019,
July 11, 2019, University of Edinburgh, Scotland,
organized by Steve Awodey, Richard Garner, Chris Heunen, Tom Leinster
and Christina Vasilakopoulou.

Quantum Physics and Logic 2019, June
1014, 2019, Chapman University, California,
organized by Bob Coecke and Matt Leifer.

Fourth Symposium on
Compositional Structures,
May 2223, 2019, Chapman University, California,
organized by Alexander Kurz.

Frontiers of Science Lecture, Georgia Tech, April 2, 2019,
organized by Matt Baker.

School of Mathematics Colloquium, Georgia Tech,
April 2, 2019.

Foundations of the Geometric Science of Information 2019, Montpellier,
February 6, 2019,
organized by Damien Calaque.

U. C. Riverside, January 8, 2019.

Centre for Quantum Technology, September 14, 2018,
DAMTP, University of Cambridge, October 4, 2018, and
The
Philosophy and Physics of Noether's Theorems: A Centenary Conference
on the 1918 Work of Emmy Noether, London, October 7, 2018,
organized by Bryan W. Roberts and Nicholas Teh.

Applied
Category Theory 2018, Lorentz Center, Leiden, April 23 
May 4, 2018,
organized by Bob Coecke, Brendan Fong, Aleks Kissinger, Martha Lewis and
Joshua Tan.

Department of Mathematics, University of Wisconsin, April 5, 2018.

AMS
Western Sectional Meeting, U. C. Riverside, November 45, 2017,
organized by John Baez.

Applied
Algebraic Topology 2017, Hokkaido University, August 812, 2017,
organized by Zin Arai, Pawe Dotko, Kathryn Hess, Yasuaki Hiraoka, Daisuke
Kishimoto, Hiroshi Kokubu, Ran Levi, Dai Tamaki and Toru Ohmoto.

Annual General Meeting,
Hong Kong Mathematical Society, May 20, 2017.

Biological Complexity: Can it be Quantified?, Beyond Center, February 2, 2017,
organized by Paul Davis, and
Stanford
Complexity Group, April 20, 2017,
organized by Aaron Goodman.
General Biology Seminar, Caltech, November 13, 2017.

Workshop on Compositionality,
Simons
Institute of Computing, December 6, 2016,
organized by Samson Abramsky, Lucien Hardy and Michael Mislove.

Statistical Physics, Information Processing and Biology,
Santa Fe Institute, November 16, 2016,
organized by David Krakauer, Michael Lachmann, Manfred Laubichler,
Peter Stadler, and David Wolpert.

Colloquium,
Santa
Fe Institute, November 15, 2016.

Bridges Lecture
Series,
St. Jerome University,
Waterloo, Canada, February 26, 2016,
organized by Benoit Charbonneau
and Alysia Kolentsis with help from Linda Carson.

Canadian
Mathematical Society Winter Meeting,
Montreal, December 5, 2015.

Broadcom,
November 18, 2015, hosted by Ray Gomez.

HigherDimensional Rewriting
and Applications,
Warsaw, June 2829, 2015, organized by Yves Guiraud, Phillipe
Malbos and Samuel Mimram.

Categorical Foundations of Network Theory,
Institute for Scientific Interchange, Turin, Italy, May 2528, 2015,
organized by Jacob Biamonte and John Baez.

NIMBioS
Workshop: Information and Entropy,
National Institute for Mathematical and Biological Synthesis,
Knoxville, Tennessee, April 8, 2015, organized by John Baez,
Marc Harper and John Harte.

GeometryAnalysisPhysics Seminar, Pennsylvania State University,
April 14, 2015,
Mathematics Department, University of York, April 15, 2015, and
8th
Minimeeting on Differential Geometry, CIMAT, Guanajuato, Mexico,
December 16, 2015.

Neural Information
Processing Seminar 2014, Montreal, December 10, 2014.

Biological
and BioInspired Information Theory,
Banff International Research Station,
October 29, 2014, organized by Toby Berger, Andrew Eckford
and Peter Thomas.

Category Theory at the Crossroads,
Schloss Dagstuhl, May 2, 2014, organized by
Samson Abramsky, John Baez, Fabio Gadducci, and Viktor Winschel.

4 talks, Department of Computer Science, University of Oxford,
February 21  March 10, 2014.

Topology Seminar, University of Oxford, February 24, 2014, and
Journées de la Fédération de recherche
en mathématiques de ParisCentre,
May 20, 2014, organized by PierreLouis Curien, Hugo Herbelin and
PaulAndré Melliès.

Mathematical Physics Seminar, FriedrichAlexanderUniversität ErlangenNürnberg, February 5, 2014.

SETI Institute, December 17, 2013, organized by Adrian Brown.

Balsillie School of International Affairs, University of Waterloo, October
2526, 2013, organized by Simon Dalby.

Higher
Structures in China IV, Lanzhou University, August 1416, 2013, and
Quantum Mathematics and Computation Symposium, University of Oxford,
October 1, 2013, organized by Samson Abramsky, Bob Coecke, Michael Colins,
Chris Douglas, Kobi Kremnitzer, Ulrike Tillmann and Jamie Vicary, and
Catégories, Logiques, Etc..., Université Paris Diderot, May 21, 2014, organized by Anatole Khelif.

CategoryTheoretic Foundations of
Mathematics Workshop, U. C. Irvine, May 5, 2013, organized by Michael
Ernst.

Climate Science
Seminar, California State University, Northridge, April 26, 2013.

Perimeter
Institute, colloquium, April 17, 2013.

SAMS 2012,
Stellenbosch University, October 30, 2012, organized by the South African Mathematical Society and the African Institute of Mathematics.

Exploratory Conference on the Mathematics of Biodiversity,
Centre de Recerca Matemàtica, Barcelona, July 5, 2012, organized by Tom Leinster and Richard Reeve.

Google, February 13, 2012, with help from Trevor Blackwell and Anybots.

CQT Annual Symposium 2011,
Centre for Quantum Technologies, December 7, 2011.

Combinatorics Seminar, Université du Québec à Montréal, July 8, 2011.

Mathematics Department Colloquium, Hong Kong University, March 23, 2011,
organized by Jianghua Lu.

Workshop on Geometry and Lie Groups,
Hong Kong University, March 25, 2011, organized by
Ngaiming Mok, Jianghua Lu and Siye Wu.
Quantum Theory and Gravitation,
ETH Zürich, June 16, 2011, organized
by Matthias Gaberdiel and Jürg Fröhlich.

Centre for Quantum Technologies, January 6, 2011, organized by Vlatko Vedral.

Quantum Physics and Logic 7,
Oxford University, May 29, 2010, organized by
Bob Coecke, Prakash Panangaden, and Peter Selinger.

Special Session on History and Philosophy of Mathematics,
2009 Fall Western Section Meeting of the AMS,
UC Riverside, November 7, 2009,
organized by Jim Tattersall and Shawnee McMurran.

Logic In Computer Science (LICS 2009),
UCLA, August 1114, 2009, program chair Andrew Pitts.

Workshop on
Categorification and
Geometrisation from Representation Theory,
University of Glasgow, April 1319, 2009, organized by
Iain Gordon, Nicolai Reshetikhin, Raphaël Rouquier and Catharina
Stroppel.

Workshop on
Higher Structures in Topology
and Geometry II,
Courant Research Center Göttingen, February 56, 2009,
organized by Chenchang Zhu and Giorgio Trentinaglia.

2009 Joint Mathematics
Meetings, special session on Categorification
and Link Homology,
Washington D.C., January 7, 2009, organized by Aaron Lauda and Mikhail
Khovanov.

The Rankin Lectures,
University of Glasgow, September 1519, 2008,
supported by the Glasgow Mathematical Journal Trust.

Algebraic Topological Methods in Computer Science 2008
University of Paris Diderot, July 7, 2008, organized by
Eric Goubault, Emmanuel Haucourt, Michel Hirschowitz, Sanjeevi Krishnan and
Martin Raussen.

Workshop on Categorical Groups,
Institut de Matemàtica de la Universitat de Barcelona, June 16,
2008, organized by Pilar Carrasco, Josep Elgueta, Joachim Kock and Antonio
Rodríguez Garzón.

Deep Beauty:
Mathematical Innovation and the Search for an Underlying Intelligibility
of the Quantum World,
Princeton, October 3, 2007, organized by Hans Halvorson.

Workshop on Poisson
Geometry and Sigma Models,
Erwin Schrödinger Institute, August 22, 2007, organized by
Anton Alekseev, Henrique Bursztyn and Thomas Strobl.

2007 Abel Symposium,
Oslo, August 8, 2007, organized by
Eric Friedlander, Stefan Schwede and Graeme Segal,
with local
organizers Nils
Baas, Bjørn Dundas, Bjørn Jahren and John Rognes.

Talk at the
AstroParticule et
Cosmologie group,
Université Paris 7, July 10, 2007.

Philosophical and Formal Foundations of Modern Physics,
Les Treilles, April 24, 2007.

Higher Categories and Their Applications,
Fields Institute, January 10, 2007.

Joint
mathematics/physics talk
at Louisiana State University, November 16, 2006, and
Mathematics
colloquium at Stanford University, December 7, 2006.

The Reese Prosser Memorial Lecture,
Mathematics Department, Dartmouth College, November 10, 2006.

Seminars
About LongTerm Thinking,
Long Now Foundation,
San Francisco, October 13, 2006.

Colloquium at the Perimeter
Institute, May 31, 2006.

2006 Barrett Lectures  Current Developments in Geometric Topology,
University of Tennessee, Knoxville, April 29  May 1, 2006.

Unni
Namboodiri Lectures,
University of Chicago, April 711, 2006.

Faculté
des Sciences, Luminy, Marseille, Feburary 27, 2006.

Geometry of Computation
2006,
January 30February 3, 2006,
Centre International de Recontres
Mathématiques (CIRM), Luminy, Marseille,
organized by Thomas
Ehrhard and Laurent Regnier.

the Union College
Mathematics Conference,
December 34, 2005, organized by Brenda Johnson, Kathryn Lesh,
Susan Niefield, Pedro Teixera and David Vella.

Loops '05,
conference at the
AlbertEinsteinInstitut, Potsdam, Germany,
October 1014, 2005.

Topics
in Homotopy Theory,
graduate summer school at the
Pacific Institute for the Mathematical Sciences, University of
Calgary, August 2226, 2005, organized by Kristine Bauer and Laura Scull.

and

Categories in Algebra,
Geometry and Mathematical Physics,
conference in honor of Ross Street's 60th birthday,
Macquarie University, Sydney, July 1116, 2005.

U. C. Irvine Algebra Seminar, May 3, 2005.

ACMSIAM
Symposium on Discrete Algorithms,
(SODA), Vancouver, British Columbia, January 24, 2005.

Arithmetic,
Geometry and Topology,
conference on the occasion of Larry Breen's 60th birthday,
Institut Galilée, Université Paris 13, France,
December 15, 2004, organized by A. Abbes, S. Lichtenbaum, L. Schwartz
and J. Tilouine.

Workshop on Quantum Gravity in the Americas: Status and Future
Directions,
Perimeter Institute, Waterloo, Canada, October 29, 2004,
organized by Etera Livine, Florian Girelli and Thomas Thiemann.

17th International Conference on General Relativity
and Gravitation,
(GR17), Dublin, Ireland, July 20, 2004.

and

and

nCategories:
Foundations and Applications,
Institute for Mathematics and
its Applications, Minneapolis, Minnesota, June 7 and June 16, 2004,
organized by Peter May and John Baez.

Non Perturbative Quantum Gravity: Loops and Spin Foams,
Centre Internationale de Recontres Mathématiques, Luminy, Marseille, France, organized by
Laurent Freidel, Phillipe Roche and Carlo Rovelli,
May 4, 2004.

Fields
Institute Program on Applied Homotopy Theory,
Department of Mathematics, University of Western Ontario,
organized by Dan Christensen and Rick Jardine,
September 20, 2003.

Gravitation: a Decennial Perspective,
Center for Gravitational Physics and Geometry, Pennsylvania State University,
June 9, 2003.

Dirac Centenary Conference,
Baylor University, Waco, Texas, October 1, 2002.

2002 Joint Spring Meeting of the Pacific Northwest Geometry Seminar
and Cascade Topology Seminar,
University of Washington, Seattle, Washington, May 12, 2002.

Workshop
on Algebraic Stacks, Intersection Theory, and NonAbelian Hodge Theory,
Mathematical Sciences Research Institute, Berkeley, California, April 5,
2002.

4 lectures at Graphs
and Patterns in Mathematics and Theoretical Physics,
conference in honor of Dennis Sullivan's 60th birthday, Department of
Mathematics and Institute of Mathematical Statistics, Stony Brook, New
York, June 1421, 2001.

9th Canadian
Conference on General Relativity and Relativistic Astrophysics,
University of Alberta, Edmonton, Canada, May 24, 2001.

CUNY Einstein Chair Mathematics Seminar,
organized by Dennis Sullivan, City University of New York, March 28, 2001.

Minnowbrook
Symposium on SpaceTime Structure,
organized by Kamesh Wali, May 29, 1999.

Program on Classical and Quantum Physics of Strong Gravitational
Fields,
program at the Institute of Theoretical Physics,
University of California
at Santa Barbara, organized by Abhay Ashtekar, Gary Horowitz and
James Isenberg, April 27, 1999.