Mar 2019 - Joint Central-Western AMS meeting, invited address, University of Hawaii at Manoa, Honolulu, HI.

Jun 2018 - SIAM Conference on Discrete Mathematics, plenary speaker, University of Colorado, Denver, CO, New developments in hypergraph Ramsey theory, slides.

Apr 2018 - Mathematics Department Colloquium, California State University, Northridge, CA, New developments in hypergraph Ramsey theory, slides.

Jan 2018 - AMS Sectional Meeting, Beyond Planarity: Crossing Numbers of Graphs, San Diego, CA, Approximating the rectilinear crossing number, slides.

Dec 2017 - UC Irvine Mathematics Colloquium, Irvine, CA, On the Erdos-Szekeres convex polygon problem.

Nov 2017 - Workshop on Algebraic Methods in Combinatorics, Harvard University, Cambridge, MA, Ramsey numbers: combinatorial and algebraic.

Nov 2017 - UCSD Combinatorics Seminar, La Jolla, CA, Ramsey numbers: combinatorial and algebraic, slides.

Aug 2017 - Eurocomb 2017, plenary speaker, Vienna, Austria, On the Erdos-Szekeres convex polygon problem.

Jun 2017 - CanaDAM, Ryerson University, plenary speaker, Toronto, ON, On the Erdos-Szekeres convex polygon problem.

May 2017 - UCSD Mathematics Colloquium, La Jolla, CA, On hypergraphs arising in geometry.

Mar 2017 - Stanford University Combinatorics Seminar, On the Erdos-Szekeres convex polygon problem.

Feb 2017 - Iowa State University, Mathematics Colloquium, Ames, IA, On the Erdos-Szekeres convex polygon problem.

Dec 2016 - Rutgers Mathematics Colloquium, New Brunswick, NJ, On the Erdos-Szekeres convex polygon problem.

Dec 2016 - UCSD Mathematics Colloquium, La Jolla, CA, On the Erdos-Szekeres convex polygon problem.

Nov 2016 - Georgia Tech, School of Mathematics Colloquium, Atlanta, GA, On the Erdos-Szekeres convex polygon problem.

Nov 2016 - UIC MSCS Departmental Colloquium, Chicago, IL, On the Erdos-Szekeres convex polygon problem, slides.

Oct 2016 - AMS Sectional Meeting, Special Session on Extremal and Probabilistic Combinatorics, Minneapolis, MN, On the Erdos-Szekeres convex polygon problem.

Oct 2016 - UIC Computer Science Seminar, Chicago, IL, Approximating the rectilinear crossing number.

Sep 2016 - Symposium on Graph Drawing and Network Visualization, Athens, Greece, Approximating the rectilinear crossing number, slides.

Aug 2016 - EXCILL III: Extremal Combinatorics at Illinois, Chicago, On the Erdos-Szekeres convex polygon problem.

Jun 2016 - A New Era of Discrete and Computational Geometry - 30 years later, Ascona, Switzerland, On the Erdos-Szekeres convex polygon problem.

Jun 2016 - SIAM Discrete Mathematics, Georgia State University, Atlanta, Off-diagonal hypergraph Ramsey numbers, slides.

May 2016 - EPFL Combinatorial Geometry and Optimization Seminar, On the Erdos-Szekeres convex polygon problem, slides.

Apr 2016 - Carnegie Mellon University, ACO Seminar, On hypergraphs arising in geometry.

Dec 2015 - UIUC Combinatorics Seminar, Extremal results for semi-algebraic hypergraphs.

Nov 2015 - Stanford University Combinatorics Seminar, Extremal results for semi-algebraic hypergraphs.

Nov 2015 - IIT Applied Mathematics Colloquium, Extremal results for semi-algebraic hypergraphs, slides.

Jun 2015 - CG Week workshop on intersection graphs, Eindhoven, Netherlands, Problems on generalizing planar graphs and thrackles, slides.

Jun 2015 - Symposium on Computational Geometry (SoCG), Eindhoven, Netherlands, Semi-algebraic hypergraph Ramsey numbers, slides.

May 2015 - Ascension of Combinatorics, EPFL, Lausanne, Switzerland, Off-diagonal hypergraph Ramsey numbers.

Jan 2015 - Symposium on Discrete Algorithms (SODA), San Diego, CA, Density and regularity theorems for semi-algebraic hypergraphs, slides.

Dec 2014 - MIT Combinatorics Seminar, Semi-algebraic Ramsey numbers and its applications, slides.

Nov 2014 - Geometric and Enumerative Combinatorics, IMA, Density-type theorems for semi-algebraic hypergraphs, slides.

Sep 2014 - UIC Combinatorics Seminar, Density-type theorems for semi-algebraic hypergraphs, slides.

Mar 2014 - Combinatorial Geometry Problems at the Algebraic Interface, IPAM, Density-type theorems for semi-algebraic hypergraphs, slides.

Dec 2013 - EPFL Combinatorial Geometry and Optimization Seminar, Density-type theorems for semi-algebraic hypergraphs, slides.

Oct 2013 - MIT Combinatorics Seminar, Extremal problems in topological graph theory, slides.

Sep 2013 - Symposium on Graph Drawing, Bordeaux France, A Ramsey-type result for geometric l-hypergraphs, slides.

Sep 2013 - Symposium on Graph Drawing, Bordeaux France, New bounds on the maximum number of edges in k-quasi-planar graphs, slides.

May 2013 - EPFL Combinatorial Geometry and Optimization Seminar, Geometric Ramsey Theory, slides.

Jan 2013 - UIC MSCS Departmental Colloquium, Chicago IL, Geometric Ramsey Theory, slides.

Sep 2012 - Symposium on Graph Drawing, Redmond WA, Density theorems for intersection graphs of t-monotone curves, slides.

Jun 2012 - Symposium on Computational Geometry (SoCG), Chapel Hill NC, Disjoint edges in complete topological graphs, slides.

Feb 2012 - Bernoulli Reunion Conference on Discrete and Computational Geometry, EPFL, Disjoint edges in complete topological graphs.

Feb 2012 - EPFL Combinatorial Geometry and Optimization Seminar, Coloring intersection graphs of x-monotone curves.

Feb 2012 - Renyi Institute Combinatorics Seminar, Budapest, Disjoint edges in complete topological graphs, slides.

Dec 2011 - MIT Combinatorics Seminar, Erdos-Szekeres-type theorems for monotone paths and convex bodies, slides.

Sep 2011 - Symposium on Graph Drawing, TU Eindhoven, k-quasi-planar graphs, slides.

Dec 2010 - Culminating Workshop in Discrete and Computational Geometry, EPFL, Erdos-Szekeres-type theorems for monotone paths and convex bodies, slides.

Jun 2010 - Symposium on Computational Geometry (SoCG), Snowbird UT, Tangencies between families of disjoint regions in the plane, slides. Talk was given by Saurabh Ray.

Nov 2007 - One-Day Combinatorial Geometry Conference, NYU, k-cross free families.

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