 Noncommutative simplices, Colloquium at Queen's University Belfast, February 10, 2017;
 Operator systems in quantum information theory and noncommutative Choquet theory, Colloquium at the University of Ottawa, January 20, 2017;
 Universal objects and extreme amenability: where topological dynamics meets Ramsey theory, Colloquium at the University of Illinois at Chicago, December 1st, 2016;
 Polish groupoids and the classification of operator algebraic varieties (slides), 2015 Winter CMS Meeting, Special Session on Descriptive set theory, December 6th, 2015;
 Noncommutative simplices and the mathematics of quantum physics, Oliver Club (Department Colloquium), Cornell University, November 19th, 2015;
 Polish groupoids and the classification problem for operator algebraic varieties, Logic Seminar, Cornell University, November 18th, 2015;
 Nonstandard methods in combinatorics, Claremont Colleges Colloquium (October 21st, 2015);
 The noncommutative Poulsen simplex, 2015 West Coast Opeator Algebras Symposium, University of California at San Diego (October 11, 2015);
 The classification of multiplier algebras of operator algebraic varieties, Colloquium, Universidad Complutense de Madrid (June 26th, 2015);
 Noncommutative analogs of the Gurarij Banach space (abstract, slides), 2015 Annual ASL Meeting, Special Session on Set Theory, University of Illinois at UrbanaChampaign (March 27th, 2015);
 The complexity of classification problems in operator algebras, Joint Mathematics Meeting 2015, Special Session on Classification Problems in Operator Algebras  San Antonio (January 11th, 2015);
 Uniqueness, homogeneity, and universality of the noncommutative Gurarij space (abstract), Canadian Mathematical Society 2014 Winter Meeting, Special Session on Operator Algebras and Operator Theory (December 8th, 2014);
 Borel complexity and automorphisms of C*algebras (abstract, slides), Workshop on Set Theory  Mathematical Research Institute of Oberwolfach (January 15th, 2014);
Invited research visits  University of Glasgow, October 26, 2017 (host: Christian Voigt)
 University of Houston, July 2428, 2017 (host: Mehrdad Kalantar)
 University of Waterloo, December 715, 2015 (host: Matthew Kennedy)
 University College London, August 1920 and December 1617 (host: Simone Severini)
 Instituto de Ciencias Matemáticas, May 2629, 2015 (host: Jordi LopezAbad)
 University of Copenhagen, April 28  May 4, 2015 (host: Asger Tornquist)
 McGill University, January 2631, 2015 (host: Marcin Sabok)
 University of Illinois at Chicago, November 1722, 2014 (host: Isaac Goldbring)
 Boise State University, April 1624, 2014 (host: Samuel Coskey)
 University of Copenhagen, August 25  September 22, 2013 (host: Asger Tornquist)
 Universidade Federal de Santa Catarina, June 928, 2013 (host: Daniel Concalves and Vladimir Pestov)
 University of Vienna, April 1520, 2012 (host: Goulnara Arzhantseva)
Invited participation to workshops  The classification problem for quantum groups, Banff International Research Station, November 2027, 2016
 Heilbronn Focussed Research Meeting "Noncommutative graphs in quantum information theory", October 37, 2016 and February 610, 2017
 Spring 2016 AMS Sectional Meeting, April 2016;
 Nonstandard methods in number theory, AIM SQuaRE meeting, Palo Alto, California, US;
 Set Theory, January 1317, 2014, Mathematical Research Institute of Oberwolfach, Obwerwolfach (Germany);
 Nonstandard methods in number theory, June 37 2013, August 48 2014, and June 2226 2015, AIM SQuaRE meeting, Palo Alto;
Seminar talks  Borel complexity and C*dynamics, Intensive Research Program on Operator Algebras Weekly Seminar, CRM Barcelonar, March 29, 2017;
 Cocycle superrigidity and group actions on C*algebras, Operator Algebras Seminar, Purdue University, February 23, 2017;
 A gametheoretic approach to Hjorth's turbulence theory, Logic Seminar, California Institute of Technology (January 17, 2017);
 Universal objects and extreme amenability: where topological dynamics meets Ramsey theory, Logic Seminar, California Institute of Technology (November 29, 2016);
 The omitting types theorem and the entropy realization problem, Logic Seminar, University of Turin (July 26, 2016);
 Weak equivalence and the entropy realization problem, UCLA Functional Analysis Seminar, UCLA (March 2nd, 2016);
 Weak equivalence for actions on the hyperfinite II_1 factor, UCSD (February 16th, 2016);
 On the Erdős sumset conjecture, Combinatorics Seminar, Caltech (January 13th, 2016);
 A functional analytic perspective on the Poulsen simplex, Functional Analysis seminar, University of Waterloo (December 13th, 2015);
 Fraisse theory and the noncommutative Poulsen simplex, CaltechUCLA logic seminar (October 9th 2015);
 Fraïssé theory and universal objects in group theory and
metric geometry, Geometry and Analysis on Groups Seminar  University of Vienna (May 6th, 2015);
 Borel complexity theory and Gromov's program, Geometry and Analysis on Groups Seminar  University of Vienna (May 5th, 2015);
 Generic spaces of operators, Séminaire de Logique  Institut Camille Jordan, Lyon (March 31st, 2015);
 A dichotomy for the complexity of the classification problem of automorphisms of C*algebras, Descriptive Set Theory Seminar  Université Paris 6 (February 17th, 2015);
 Generic spaces of operators, Séminaire Général de Logique  Université Paris 7 (February 16th, 2015);
 An invitation to sofic groups, Geometric & Combinatorial Group Theory Seminar  McGill University, Montreal (January 28th, 2015);
 Polish groupoids and functorial complexity, Category Seminar  McGill University, Montreal (January 27th, 2015);
 The noncommutative Gurarij space (abstract), Logic Seminar  University of Illinois at Chicago (November 18th, 2014):
 The noncommutative Gurarij space and other Fraisse limits in functional analysis (abstract), Model Theory Seminar  McMaster University, Hamilton, Ontario, Canada (October 28th, 2014);
 Functorial complexity of Polish and analytic groupoids, Set Theory Seminar, Fields Institute (August 1st, 2014);
 Conjugacy and cocycle conjugacy of automorphisms of O_2 are not Borel (abstract), Operator Algebras Seminar, Fields Institute (April 15th, 20114);
 Borel complexity and automorphisms of C*algebras (abstract, slides), Group Actions and Dynamics Seminar, University of Texas at Austin (March 5th, 2014);
 Sofic and hyperlinear groups and the logic for metric structures (abstract), Geometry and Analysis on Groups Seminar  University of Vienna (October 2nd, 2013);
 The algebraic eigenvalues conjecture for sofic groups (abstract), Operator Algebras Seminar  University of Copenhagen (September 18th, 2013);
 Classification of automorphisms of operator algebras up to conjugacy (abstract), Seminar on Set Theory and Applications  University of Copenhagen, Denmark (September 5th, 2013);
 The complexity of the relation of unitary equivalence for automorphisms of separable unital C*algebras (abstract), Analysis Seminar  University of Waterloo (October 19th, 2012);
 The complexity of the relation of unitary equivalence for automorphisms of separable unital C*algebras (abstract), Operator Algebras Seminar  Fields Institute (October 16th, 2012);
 La logica per strutture metriche ed il numero di gruppi sofici e iperlineari universali (abstract, slides)  University of Turin, Italy (June 27th, 2012);
 Turbulent actions on automorphism groups of C*algebras (abstract), Operator Algebras Seminar  Fields Institute (April 12th, 2012);
 Nonstandard methods and additive combinatorics: effective estimates for Jin's theorem (abstract), Logic Seminars at Pisa  University of Pisa (April 23rd, 2012);
 Logic for metric structures and the number of universal sofic and hyperlinear groups (abstract), Set Theory Seminar  Fields Institute (January 20th, 2012);
 The Continuum Hypothesis and ultrapowers of C*algebras and von Neumann algebras, Logic Seminars at Pisa  University of Pisa (May 31st, 2011);
 The structure theorem for unitary representations of amenable groups, Logic Seminars at Pisa  University of Pisa (16th June, 2010).
Other talks and presentations Groupoid Lp operator algebras (abstract, slides), Canadian Annual Symposium on Operator Algebras and Their Applications (June 26th, 2014);
 An introduction to Fourier analysis and Roth's theorem (slides), AIM SQuaRE preparatory meeting (April 11th, 2013);
 An introduction to Borel complexity of equivalence relations, University of Virginia, Charlottesville (March 8th, 2013);
 Some nonstandard techniques in combinatorics (slides), AIM SQuaRE preparatory meeting (June 7th, 2012);
 Classification of automorphisms of C*algebras (abstract, slides), Canadian Operator Symposium 2012  Queen's University (May 24th, 2012)
Other workshop and conferences  LMS Research School "Combinatorics and Operators in Quantum Information Theory", Queen's University Belfast, September 59, 2016;
 Measured Group Theory, August 29  September 2, 2016, MFO, Oberwolfach, Germany;
 C*algebras, August 2226, 2016, MFO, Oberwolfach, Germany;
 Dynamics and C*Algebras: Amenability and Soficity, October 2024, 2014, BIRS, Banff, Alberta, Canada;
 42nd Canadian Annual Symposium on Operator Algebras and Their Applications, June 2327 2014, Fields Institute, Toronto, Canada;
 Thematic program on Abstract Harmonic Analysis, Banach and Operator Algebras, JanuaryJune 2014, Fields Institute, Toronto, Canada;
 Arbeitsgemeinschaft: Sofic Entropy, October 711, 2013, MFO, Oberwolfach, Germany;
 Descriptive Set Theory, September 30  October 4, ESI, Vienna, Austria;
 Forcing and Large Cardinals, September 2327, 2013, ESI, Vienna, Austria;
 Groups, Dynamical Systems and C*Algebras, August 2024, 2013, Westfälische WilhelmsUniversität Münster, Münster, Germany;
 Canadian Annual Symposium on Operator Algebras and their Applications, May 2731, 2013, Fields Institute, Toronto, Canada;
 Masterclass on Sofic Groups and applications to Operator Algebras, November 59, 2012, University of Copenhagen, Denmark;
 Thematic program on Forcing and its Applications, JulyDecember 2012, Fields Institute, Toronto, Canada;
 Continuous Logic and Functional Analysis, July 1620, 2012, Institut Camille Jordan, Lyon, France;
 Canadian Operator Symposium 2012, May 2125, 2012, Queen's University, Kingston, Ontario, Canada;
 5th Young Set Theory Workshop, April 30  May 4, 2012, CIRM, Marseille, France;
 2011 CMS Winter Meeting, December 1012, 2011, Delta Chelsea Hotel, Toronto, Ontario, Canada;
 Computational Prospects of Infinity II, June 15  July 13, 2011, IMS, National University of Singapore, Singapore;
 Ramsey Theory in Logic, Combinatorics and Complexity, May 2227, 2011, University Residential Center, Bertinoro, Italy;
 Advanced courses on II_1 factors, May 220, Institut Henri Poincare, Paris, France;
 An invitation to von Neumann algebras and ergodic theory of group actions, CIRM, Marseille, France;
 Group Actions on Measure Spaces, March 2427, 2011, Texas A&M University, College Station, USA;
 The Concentration Phenomenon, Transformation Groups and Ramsey Theory, October 1215, 2010, Fields Institute, Toronto, Canada;
 Infinite Combinatorics, June 28, 2010, Mathematics Research Center "Ennio De Giorgi", Pisa, Italy.

