*"TBD", plenary talk, Operator Theory and Operator Algebras: A conference in honour of Kenneth R. Davidson , University of Waterloo.**"Operator algebras associated with C*-correspondences and product systems", two plenary talks, 9th Summer School in Operator Theory , National Technical University of Athens, Greece, July 10-15, 2023.**"Tensor algebras of Product Systems and their C*-envelpes", plenary talk, 46th Canadian Operator Symposium , University of Manitoba, June 4 - June 8, 2018.**"All semicrossed products of operator algebras are stably isomorphic to crossed products", plenary talk, Mathematical Analysis in Athens - Katavolos and Nestoridis , University of Athens, December 15-19, 2017.**"Non-Selfadjoint Operator Algebras: dynamics, classification and C*-envelopes"*five one-hour plenary talks, Recent Advances in Operator Theory and Operator Algebras 2014, Indian Statistical Institute, Bangalore Statistics and Mathematics Unit, India, December 09, 2014 - December 19, 2014.*"Piecewise Conjugacy as an isomorphism invariant for Operator Algebras"*one-hour plenary talk, International Conference on Operator Algebras, Nanjing University of Science and Technology, China, June 20-23, 2013.*?Crossed product constructions in operator algebra theory?,*one-hour plenary talk, 23rd International Conference on Operator Theory, Timisoara, June29-July 4, 2010, Romania.*"Non-selfadjoint crossed products",*one-hour plenary talk, 22nd International Conference on Operator Theory, Timisoara, Romania, July 3-8, 2008.*"Operator algebras for multivariable dynamics",*one-hour plenary talk, 35rd Canadian Operator Symposium, University of Guelph, June 5-9, 2007.*"Operator algebras for multivariable dynamics",*one-hour plenary talk, GPOTS 2007, ,University of Nebraska-Lincoln, May 15-20, 2007.*"Operator algebras from directed graphs",*one-hour invited address, 11th Panellenic Analysis Conference ,University of Thessaloniki, May 23-25, 2006.*"The structure of free semigroup algebras",*opening plenary talk, SUMIRFAS 2000, August 11 2000, Texas A&M University.*"Geometric aspects of the theory of nest algebras" two ninety minutes plenary talks to the NATO Advanced Study Institute on "Operator Algebras and Applications", at Samos (August 1996).*

*"Crossed products of operator algebras"*presented at the 2Spring Central Sectional Meeting North Dakota State University, Fargo, ND, April 16, 2016. (Special Session on Dynamics, Inverse Semigroups, and Operator Algebras).*"Local maps and the representation theory of operator algebras"*presented at the 2015 Joint Mathematics Meeting, San Antonio, TX, January 12, 2015. (Special Session on Noncommutative Function Theory).*"Piecewise Conjugacy as an isomorphism invariant for Operator Algebras"*presented at the American Mathematical Society Spring Central Sectional Meeting at Ames, Iowa, April 26-28, 2013. (Special Session on Operator Algebras and Topological Dynamics).*"The C*-envelope of a tensor algebra revisited" presented at the Annual Meeting of the American Mathematical Society, New Orleans LA, January 8, 2011. (Special Session).**"Convex combinations of extreme points in operator algebras"*presented at the American Mathematical Society regional meeting at Columbia, SC, March 16, 2001. (Special Session).*"Primitive limit algebras and C*-envelopes"*, presented at the American Mathematical Society regional meeting at Birmingham, AL, November 11, 2000. (Special Session).*"Irreducible representations of limit algebras"*presented at the Annual Meeting of the American Mathematical Society, Washington, DC, January 19, 2000. (Special Session).*"Semisimple TUHF algebras are primitive"*, delivered at the special session "Operator Theory including applications in operator algebras and wavelets", 949th American Mathematical Society Meeting, Charlotte, NC, October 15-17, 1999.*"Some primitive triangular operator algebras, their structure spaces and their epimorphisms"*presented at the Annual Meeting of the American Mathematical Society, San Antonio TX, January 16, 1999 (Special Session).*"Factorization in nest algebras II"*presented at the Annual meeting of the American Mathematical Society, Baltimore MD, January 7-10, 1998 ( Special Session).*"Some results on certain reflexive operator algebras"*presented at the American Mathematical Society Regional Meeting, College Station TX, October 22-23, 1993 (Special Session).*"Operator equations in CSL algebras"*, presented at the American Mathematical Society Regional Meeting, Tuscaloosa AL, March 14, 1992 (Special Session).*" On reflexive operator algebras"*, presented at the American Mathematical Society Regional Meeting, Muncie IN, October 27-28, 1989 (Special Session).

## Other invited talks.

*"Isomorphisms and stable isomorphisms of non-selfadjoint operator algebras"*, invited talk, NYC Noncommutative Geometry (online seminar), April 19, 2023.*"Isomorphisms and stable isomorphisms of non-selfadjoint operator algebras"*, organizer and conference talk, IWOTA 2022, Krakow, Poland, September 6-10, 2022.*"Isomorphisms and stable isomorphisms of non-selfadjoint operator algebras"*, invited conference talk in honor of Paul Muhly, Technion, Israel, June 26-July 1, 2022.*"Co-universal C*-algebras for product systems, I"*, invited conference talk, Hilbert C*-Modules Online Weekend, Moscow Center for Fundamental and Applied Mathematics and Moscow State University, December 5-6, 2020.*"Non-commutative boundaries for tensor algebras"*, member of Focused Research group, BIRS, Banff, Canada, March 1-8, 2020.*"Hyperrigidity for operator algebras"*, invited seminar talk, Dynamics, Geometry and C*-algebras, University of Copenhagen, February 21, 2020.*"The non-selfadjoint approach to the Hao-Ng isomorphism"*, invited talk at the special session Analysis and Synthesis for Operator Algebras, IWOTA 2019, July 19-23, Lisbon, Portugal.*"Tensor algebras of product systems and their C*-envelopes"*, invited seminar talk, University of Illinois Urbana-Champaign, October 23, 2018.*"Tensor algebras of product systems and their C*-envelopes"*, invited seminar talk, Chinese Academy of Science, Beijing, China, July 11, 2018.*"Crossed Products of Operator Algebras: applications of Takai duality", invited talk, Multivariable Operator Theory at the Technion, Israel, June 18-22, 2017. (On the occasion of Baruch Solel's 65th Birthday.)**"Crossed Products of Operator Algebras", invited talk, Groups, Dynamics, and Operators Algebras (conference organized by Kerr and Li), Queen Mary University, London, UK, July 19, 2016.**"Crossed Products of Operator Algebras"*, invited talk, Chern Institute of Mathematics, Nankai University, Tianjin, China, June 17, 2016.*"Local maps and representation theory", invited talk, Multivariate Operator Theory, Banff International Research Station, Alberta, Canada, April 5-10, 2015.**"Piecewise Conjugacy as an isomorphism invariant for Operator Algebras", invited talk, Operator algebras and dynamical systems from number theory, Banff International Research Station, Alberta, Canada, November 24-29, 2013.**"Operator Algebras, Dynamical Systems and C*-correspondences"*, two plenary talks, 2nd Summer School on Operator Theory, Karlovassi, Samos, Greece, July 23-28, 2012.*"Dynamical Systems and Operator Algebras"*, two plenary talks, 1st Summer School on Operator Theory, Chios, Greece, July 25-30, 2011*"Semicrossed Products of Operator Algebras and their C*-envelopes"*, invited speaker, Multivariate Operator Theory, Banff International Research Station, Alberta, Canada, August 15-20, 2010.*"Semicrossed products of the non-commutative disc algebras"*, invited speaker, The Fields Institute, Workshop on multivariate operator theory, August 10-14, 2009.*"Operator algebras for multivariable dynamics", Operator Methods in Fractal Analysis, Wavelets and Dynamical Systems, invited speaker, Banff International Research Station, December 2-7, 2006.**"Operator algebras from directed graphs"*one-hour invited address, 11th Panellenic Analysis Conference ,University of Thessaloniki, May 23-25, 2006.*"Operator algebras from directed graphs"*one-hour invited address, GroupoidFest 05, Iowa State University. Ameas, November 5,6, 2005*"Operator algebras associated with directed graphs"*, main speaker, Professor Tsitas' retirement conference, University of Athens, July 14, 2004.*"Isomorphisms of algebras associated with directed graphs"*, invited speaker, Coordinate methods in nonselfadjoint operator algebra, Banff International Research Station, December 13-18, 2003.*"Representations of non-selfadjoint operator algebras"*, invited speaker, The Fields Institute, Workshop on Nonself-adjoint Operator Algebras, July 8-12, 2002.*"Representations for operator algebras and applications to their facial structure"*, invited speaker, opening talk at Nebraska-Iowa Functional Analysis Seminar, Des Moines, October 13 2001.*"Isomorphisms and epimorphisms of limit algebras" ma*invited speaker, Nebraska-Iowa Functional Analysis Seminar, Des Moines, April 25, 1998.