- Crystal monoids and crystal bases (CSA International Conference on Semigroups and Automata, Lisbon, June 2016)

[Slides] - Crystal monoids and crystal bases: rewriting systems and biautomatic structures for Plactic monoids (Manchester, Algebra Seminar, April 2016)

[Slides] - Set-homogeneous structures (Workshop on Homogeneous Structures, Banff International Research Station, Banff, Canada, November 2015)

[Slides] - Presentations for symmetric groups encoded by idempotents in the full transformation monoid (LMS Durham Research Symposium Permutation groups and transformation semigroups, Durham University, July 2015)

[Slides] - On regularity and the word problem for free idempotent generated semigroups (The Algebraic Theory of Semigroups and Applications special session at a joint meeting of the American, European and Portuguese Mathematical Societies, Porto, Portugal, June 2015)

[Slides] - Crystal monoids (AAA90, 90th Workshop on General Algebra - 90. Arbeitstagung Allgemeine Algebra, Novi Sad, Serbia, June 2015)

[Slides] - Crystal monoids (North British Semigroups and Applications Meeting, University of St Andrews, April 2015)

[Slides] - Finite Gröbner-Shirshov bases for Plactic algebras and biautomatic structures for Plactic monoids (University of Linz, Austria, April 2014)

[Slides] - Infinite monoids as geometric objects (University of Essex, March 2014)

[Slides] - On groups encoded by the structure of the idempotents in the full linear monoid (Geometry and Topology Seminar, University of Warwick, October 2013)

[Slides] - Finite Gröbner-Shirshov bases for Plactic algebras and biautomatic structures for Plactic monoids (Geometric, Combinatorial & Dynamics Aspects of Semigroups and Groups, On the occasion of the 60th birthday of Stuart Margolis Bar-Ilan, Israel, June 2013)

[Slides] - Infinite monoids as geometric objects (Semigroups and Applications Novi Sad, June 2013)

[Slides] - Finite Gröbner-Shirshov bases for Plactic algebras and biautomatic structures for Plactic monoids (Semigroup Representations, ICMS, Edinburgh April 2013)

[Slides] - Free idempotent generated semigroups over the full linear monoid (Semigroups and Applications, Uppsala, September 2012)

[Slides] - Poster presentation: Countably infinite set-homogeneous structures (Perspectives in Discrete Mathematics, Centre de Recerca Matematica, Bellaterra, Spain, June 2012)

[Slides] - Idempotent generating sets for semigroups and combinatorics of bipartite graphs (Workshop on Semigroups 2012 (to remember John M. Howie on the occasion of his 76th birthday), Lisbon, May 2012)

[Slides] - Free idempotent generated semigroups over the full linear monoid (Novi Sad, AAA83, March 2012)

[Slides] - Free Idempotent Generated Semigroups and their Maximal Subgroups (Groups and Semigroups: Interactions and Computations, Lisbon, July 2011)

[Slides] - Countable 2-arc-transitive bipartite graphs via partially ordered sets (LMS Northern Regional Meeting and Workshop on Homogeneous Structures, Leeds, July 2011)

[Slides] - On Maximal Subgroups of Free Idempotent Generated Semigroups (Seminario de Semigrupos, Automatos e Linguagens, Univeristy of Lisbon, November 2010)

[Slides] - Homogeneous Structures (Fronteiras da Matemática, Workshop para alunos do 1º Ciclo, Faculdade de Ciências, Universidade de Lisboa, April 2010)

[Slides] - Combinatorial structures with lots of symmetry (Algebra seminar, Centre of Algebra, University of Lisbon, October 2009)

[Slides] - Homotopical and Homological Finiteness Properties of Monoids and their Subgroups (International Conference on Geometric and Combinatorial Methods in Group Theory and Semigroup Theory, University of Nebraska-Lincoln, May 2009)

[Slides] - Homotopical and Homological Finiteness Properties of Monoids and their Subgroups (North British Semigroups and Applications Network Meeting, St Andrews, April 2009)

[Slides] - Locally-finite connected-homogeneous digraphs (Groups and Infinite Graphs, Erwin Schrodinger International Institute, Vienna, Austria, September 2008)

[Slides] - Set-homogeneous digraphs (ROGICS - International Conference on Relations, Orders and Graphs: Interaction with Computer Science , Mahdia, Tunisia, May 2008)

[Slides] - Graphs and digraphs with many symmetries, and a wonderfully elegant argument of Hikoe Enomoto (St Andrews Pure Maths Colloquium, May 2008)

[Slides] - Approaching cosets using Green's relations and Schutzenberger groups (Algebra Workshop, Centre of Algebra, University of Lisbon, April 2008)

[Slides] - Approaching cosets using Green's relations and Schutzenberger groups (British Mathematical Colloquium, York, March 2008)

[Slides] - Connected-homogeneous graphs (BIRS Workshop on Infinite Graphs, Banff International Research Station, Canada, October 2007)

[Slides] - On connected-homogeneity in graphs and partial orders (Combinatorics of Arc-Transitive Graphs and Partial Orders, University of Leeds, August 2007)

[Slides] - Connected-homogeneous graphs (The 2007 British Combinatorial Conference, University of Reading, July 2007)

[Slides] - Graphs with a high degree of symmetry (One-day meeting of the Cambridge/Leeds/Norwich Set Theory Group ('CAMELEON'), University of Leeds, June 2007)

[Slides] - Locally finite graphs with more than one end (Model Theory Seminar, University of Leeds, May 2007)

[Slides] - Finiteness conditions and index in semigroup theory (Leeds Algebra Seminar, University of Leeds, January 2007)

[Slides] - Finiteness conditions and index in semigroup theory (Glasgow Algebra Seminar, University of Glasgow, November 2006)

[Slides] - Finiteness conditions and index in semigroup theory (MAXIMALS Algebra Seminar, University of Edinburgh, November 2006)

[Slides] - Finite semigroups and their generating sets (Model Theory Seminar, University of Leeds, May 2006)

[Slides] - Semigroup presentations via boundaries in Cayley graphs (British Mathematical Colloquium, Newcastle University, April 2006)

[Slides] - Boundary Index and Finite Presentability of Subsemigroups ( International Conference on Semigroups and Languages, University of Lisbon, July 2005)

[Slides] - Generating Sets of Ideals of Endomorphism Monoids (PoPMiNE Postgraduate Conference in Pure Mathematics, University of Newcastle, June 2004)

[Slides] - Generating Sets of Finite
*0*-Simple Semigroups (British Mathematical Colloquium, Queens University Belfast, April 2004)

[Slides]