## Minicourses

I was invited to give a minicourse about expander graphs at the summer school geometric group theory without boundaries (20–31 July 2020, virtual). The recordings of the talks are available here.

I was also invited to give a minicourse on expander graphs at the Graduate Student Concentration Week on Metric Geometry 25–29 July 2022 - Texas A&M

## Invited Talks

2023, Dec 19

*Ein Märchen der Weihnachtselfen und digitalen Revolution*, Weihnachtsvorlesung - Göttingen Christmas lecture (outreach)

2023, Sep 12

*On coarse geometry and group theory*, Workshop: Totally disconnected locally compact groups from a geometric perspective - Münster

2023, Apr 27

*An invitation to coarse groups*, Gruppen- und Operatoralgebren-Treffen - Potsdam

2023, Apr 6

*Roe-like C*-algebras for actions on meausure spaces*, Seminar on Algebra and Combinatorics - Leipzig

2023, Mar 15

*Discrete fundamental groups as invariants of coarse geometry*, Workshop: Discrete and combinatorial homotopy theory - AIM (San Jose - California)

2022, Dec 15

*On coarse homomorphisms and their kernels*, Séminaire d'Algèbres d'Opérateurs - IMJ-PRG (Paris)

2022, Nov 10

*On group actions and expansion*, RTG Colloquium - Göttingen

2022, Sep 15

*Coarse groups*, Workshop on Expansion and Approximation - Copenhagen

2022, Sep 1

*An invitation to coarse groups*, Geometry and Topology Seminar - Technion (Haifa)

2022, May 19

*On strong ergodicity, C*-algebras and Markov operators of group actions*, Operator algebras and Group Dynamics Workshop - CIRM (Marseille)

2022, May 10

*On Roe algebras of warped cones*, Oberseminar C*-Algebren - Münster

2022, May 5

*Coarse structures, groups and automorphisms*, Differential Geometry Seminar - Heidelberg

2022, May 4

*Coarse groups and their coarse actions*, Oberseminar Geometrie - Gießen

2022, Mar 3

*An invitation to coarse groups*, Wokshop: Geometric Structures in Group Theory - Oberwolfach

2022, Feb 9

*Strong ergodicity, projections and Markov operators*, NYC noncommutative geometry seminar - St Johns University (New York City)

2022, Jan 18

*On projections, exhaustions by expanders and ergodic actions*, Focused Research Workshop: Higher-Dimensional Expanders - Bristol

2021, Jul 22

*Is high dimensional expansion invariant under coarse equivalence*, Online meeting: high-dimensional expanders, coarse geometry and infinite group theory - Bristol

2021, Jun 1

*Cube complexes with coupled links*, Tee Seminar - Münster

2021, Jan 8

*Expanders of dynamical origin*- Heidelberg

2020, Dec 1

*Markov operators and ghost projections*, Oberseminar C*-Algebren - Münster

2020, Nov 23

*Coarse groups and their coarse actions*, GGT seminar - Münster

2020, Aug 17

*Asymptotic expander graphs*, Symmetries in Newcastle - Newcastle (Australia)

2020, Jul 1

*Of measurable actions and finite graphs*, Online geometry seminar - ETH (Zurich)

2020, May 27

*From group actions to finite graphs and back*, Operator Algebras Seminar - Copenhagen

2019, Jul 18

*On metrics, measures and dynamics: expanders via warped cones*, colloquium - Karlsruhe

2019, Jun 5

*Geometry of actions on metric/measure spaces*, Simons Semester on Geometric and Analytic Group Theory - IMPAN (Warsaw)

2019, May 10

*Discrete fundamental group: the large and the small*, Junior Topology and Group Theory seminar - Oxford

2019, Apr 11

*An introduction to warped cones*, Probability and Ergodic Theory seminar - Ben-Gurion University (Beer-Sheva)

2019, Mar 19

*Discrete fundamental groups and warped cones*- Indiana University (Bloomington - IN)

2019, Mar 14

*Proving hyperbolicity for cube complexes*, Spring Topology and Dynamics Conference - Birmingham (AL)

2019, Mar 12

*Cube complexes with coupled links*, Geometric Group Theory and Topology seminar - Tufts University (Boston - MA)

2019, Jan 10

*Cube complexes with coupled links*, Geometry and Topology seminar - Technion (Haifa)

2018, Oct 12

*Expander graphs and how to find them*, Geometry Graduate Colloquium - ETH (Zurich)

2018, Oct 4

*Expanders via actions on manifolds*, Geometry Tea - Cambridge

2018, Aug 23

*Non-positively curved cube complexes with hyperbolic fundamental group*- KAIST (Daejeon)

2018, May 18

*Geometric constructions of expanders*, Combinatorics Seminar - Warwick

2018, Apr 18

*Coarse geometry of approximating graphs: discrete fundamental group*, Mini-Workshop on Superexpanders and Their Coarse Geometry - Oberwolfach

2018, Mar 26

*Warped systems of actions on metric spaces*, Groups, Actions and von Neumann algebras seminar - Orsay

2018, Jan 29

*A geometric construction of expanders*, Algebra, Combinatorics, Measure Seminar - Lancaster

2018, Jan 22

*Coarse geometry of expanders*, Kleines Seminar - Münster

2017, Sep 30

*Super-expanders via approximating graphs*, Workshop on Operator algebras, Geometry and Actions - Warsaw

2017, May 2

*Approximating graphs: a geometric constructions of expanders*, Seminaire Groupes et Analyse - Neuchâtel

2017, Feb 27

*An introduction to expanders and how to construct them*, Junior Geometry and Topology Seminar - Warwick

## Contributed Talks

2022, Mar 31

*An invitation to coarse groups*, Topological and Homological Methods in Group Theory - Bielefeld

2021, Sep 6

*Coarse Groups*, Ventotene International Workshop - Ventotene

2019, Oct 15

*Strong Property (T) in the proof of the Zimmer Conjecture*, Arbeitsgemeinschaft - Oberwolfach

2018, Jul 19

*Constructing expanders by approximating geometric actions*, GAGTA - Seoul

2018, Jul 5

*Warped cones: a coarse geometric invariant of actions*, workshop on Dynamical methods in Algebra, Geometry and Topology - Udine

2018, May 24

*Cube Complexes with Coupled Links*, workshop on Nonpositively Curved Groups on the Mediterranean - Nahsholim

2017, Jun 29

*Approximating graphs: a geometric constructions of expanders*, yGAGTA - Bilbao