*Solving semidecidable problems in group theory*, Oxford Algebra Seminar, 2 November 2021*Kaplansky's conjectures*, Muenster GGT Seminar, 28 October 2021*Kaplansky's conjectures*, ETHZ Geometry Seminar, 20 October 2021*Solving semidecidable problems in group theory*, SMRI Algebra and Geometry Seminar, 5 October 2021*Kaplansky's conjectures*, Global NCG Seminar, 17 September 2021*Diffuse groups*, World of GroupCraft, 26 August 2021*Kaplansky's conjectures*, Isfahan Mathematics Colloquium, 4 August 2021*Kaplansky's conjectures*, Bonn Topology Seminar, 13 July 2021*Kaplansky's conjectures*, Ischia GOTHIC seminar, 8 July 2021*Kaplansky's conjectures*, Probabilistic and Geometric Group Theory, 23 June 2021*Kaplansky's conjectures*, Oxford Algebra Seminar, 8 June 2021*Kaplansky's conjectures*, Knot Theory Seminar of Roger Fenn and Louis Kauffman, 4 June 2021*Kaplansky's conjectures*, Technion Geometry and Topology Seminar, 3 June 2021*Kaplansky's conjectures*, Muenster C*-algebra Seminar, 1 June 2021*Kaplansky's conjectures*, Karlsruhe Topology Seminar, 17 April 2021*Kaplansky's conjectures*, Muenster Kramer Teeseminar, 13 April 2021*Kaplansky's conjectures*, NY Group Theory Seminar, 11 March 2021*Kaplansky's conjectures*, Cambridge GGT Seminar, 26 February 2021*Kaplansky's conjectures*, Symmetry in Newcastle, 22 February 2021

*Leighton's Theorem*, Bielefeld-Münster Seminar on Groups, Geometry and Topology, 17 January 2020*One-relator groups and the Haagerup property*, University of Vienna Geometry and Analysis on Groups Research Seminar, 14 January 2020*The isomorphism problem for Coxeter groups*, Flags, Galleries and Reflection Groups, University of Sydney, 8 August 2019*Boundaries of hyperbolic and CAT(0) groups and Cannon--Thurston maps*, Bielefeld Oberseminar Groups and Geometry, 19 June 2019*Boundaries of hyperbolic and CAT(0) groups and Cannon--Thurston maps*, Bonn Oberseminar Topologie, 16 April 2019*Boundaries of hyperbolic and CAT(0) groups and Cannon--Thurston maps*, Münster Oberseminar Topologie, 28 January 2019*Exotic one-relator groups*, EPFL Ergodic and Geometric Group Theory Seminar, 17 May 2018*Exotic one-relator groups*, Neuchâtel Séminaire Groupes et Analyse, 15 May 2018*Exotic one-relator groups*, Regensburg SFB-Seminar, 10 April 2018.*Dehn functions of one-relator groups*, Oxford Junior Topology and Geometry Seminar, 28 February 2018.*Finding and not finding unusual one-relator groups*, Winter One-Relator Workshop, 11 January 2018.*The geometry of the word problem*, Warwick Junior Geometry and Topology Seminar, 8 January 2018.*One-relator groups with no bad subgroups*, Bielefeld Oberseminar Groups and Geometry, 3 January 2018.*One-relator groups with no bad subgroups*, Technion Groups, Dynamics and Related Topics Seminar, 7 December 2017.*Determining hyperbolic 3-manifold groups by their finite quotients*, Sydney Group Actions Seminar, 23 August 2017.*Deficiencies of finite groups*, yGAGTA, 28 June 2017. Talk notes.*Hyperbolic groups and their subgroups*, Glasgow Algebra Seminar, 15 February 2017*The word problem and one-relator groups*, Cambridge Geometric Group Theory Seminar, 10 August 2016