Some presentations

Lectures/tutorials

Submodular functions and their applications (plenary talk at SIAM Conference on Discrete Mathematics 2014)
Submodular functions and their applications (plenary talk at ACM-SIAM Symposium on Discrete Algorithms 2013)
Tutorial on submodular optimization: part 1, part 2 (Modern Aspects of Submodularity workshop, Georgia Tech 2012)

Some research talks

The Lovasz Local Lemma: constructive aspects, stronger versions and the hard core model (Stanford, February 2016)
Approximability of multiway partitioning problems (Banff 2014 workshop)
Communication complexity of combinatorial auctions with submodular bidders (SODA 2013 talk)
Computational complexity of truthful mechanisms for combinatorial auctions (EC 2012 top 10% paper; these slides are from the Algorithmic Frontiers workshop at EPFL)
From query complexity to computational complexity (STOC 2012 paper)
Randomized rounding in matroid polytopes (FOCS 2010 paper)
PTAS for matroid matching (STOC 2010 paper)
Symmetry and hardness of submodular maximization problems (FOCS 2009 paper)
Combinatorial allocation and submodular maximization over a matroid (STOC 2008 paper; these slides are from a RIMS workshop in Kyoto)