**Video Presentations.**

Matrix Factorizations in Mathematics and Physics, and TQFT June 16, 2017, Simons Center for Geometry and Physics, Stonybrook New York, USA.

Wall Crossing, Quantum Integrable Systems, and TQFT November 18, 2014, Simons Center for Geometry and Physics, Stonybrook New York, USA.

Linking representation theory, singularity theory and non-commutative algebraic geometry, May 9, 2012, BIRS, Banff, Canada.

Derived categories in Algebraic Geometry, September 8, 2011, Steklov Institute, Moscow, Russia.

**Slides.**