CAUTION: The Sender of this email is not from within Dalhousie. CALL FOR PARTICIPATION Fourth Annual International Conference on Applied Category Theory (ACT 2021) 12 - 16 July, 2021, Cambridge, United Kingdom (and online), 09:00-17:30 BST Webpage: https://www.cl.cam.ac.uk/events/act2021 Registration for online participation: https://forms.gle/KENNAbk6iLwqJ7i36 * * * The Fourth International Conference on Applied Category Theory will take place at the Computer Laboratory of the University of Cambridge on 12-16 July, 2021, preceded by the Adjoint School 2021 on 5-9 July. This conference follows previous events at MIT, Oxford and Leiden. Applied category theory is a topic of interest for a growing community of researchers, interested in studying many different kinds of systems using category-theoretic tools. These systems are found across computer science, mathematics, and physics, as well as in social science, linguistics, cognition, and neuroscience. The background and experience of our members is as varied as the systems being studied. The goal of the Applied Category Theory conference series is to bring researchers together, disseminate the latest results, and facilitate further development of the field. For a full schedule of talks, please see https://www.cl.cam.ac.uk/events/act2021/#programme. The conference will be run as a hybrid event, with physical attendees present in Cambridge, and other participants taking part online. Physical registration is now closed, but online registration is still available: https://www.cl.cam.ac.uk/events/act2021/#registration. ** PROGRAMME COMMITTEE ** Chair: - Kohei Kishida, University of Illinois, Urbana-Champaign Members: - Richard Blute, University of Ottawa - Spencer Breiner, NIST - Daniel Cicala, University of New Haven - Robin Cockett, University of Calgary - Bob Coecke, Cambridge Quantum Computing - Geoffrey Cruttwell, Mount Allison University - Valeria de Paiva, Samsung Research America and University of Birmingham - Brendan Fong, Massachusetts Institute of Technology - Jonas Frey, Carnegie Mellon University - Tobias Fritz, Perimeter Institute for Theoretical Physics - Fabrizio Romano Genovese, Statebox - Helle Hvid Hansen, University of Groningen - Jules Hedges, University of Strathclyde - Chris Heunen, University of Edinburgh - Alex Hoffnung, Bridgewater - Martti Karvonen, University of Ottawa - Kohei Kishida, University of Illinois, Urbana-Champaign (chair) - Martha Lewis, University of Bristol - Bert Lindenhovius, Johannes Kepler University Linz - Ben MacAdam, University of Calgary - Dan Marsden, University of Oxford - Jade Master, University of California, Riverside - Joe Moeller, NIST - Koko Muroya, Kyoto University - Simona Paoli, University of Leicester - Daniela Petrisan, Universit=C3=A9 de Paris, IRIF - Mehrnoosh Sadrzadeh, University College London - Peter Selinger, Dalhousie University - Michael Shulman, University of San Diego - David Spivak, MIT and Topos Institute - Joshua Tan, University of Oxford - Dmitry Vagner - Jamie Vicary, University of Cambridge - John van de Wetering, Radboud University Nijmegen - Vladimir Zamdzhiev, Inria, LORIA, Universit?? de Lorraine - Maaike Zwart [For admin and other information see: http://www.mta.ca/~cat-dist/ ]