Arrangements and Their Applications, Discrete Math Day, Carleton University, Ottawa, Canada, 1998.
Efficient Techniques in Geometric Optimization: An overview, Israeli Workshop on Computational Geometry, Israel, 1999.
Efficient Algorithms for Geometric Clustering: An Overview, Computational Geometry Workshop, New Delhi, India, 2000.
Data Strutures for Moving Objects, Distinguished Lecture Series, Ohio State University, Columbus, Ohio, 2001.
Arrangements: Algorithmics and Combinatorial Applications, The Goodman-Pollack Two-Thirds-Of-A-Century Fest, Courant Institute, New York, 2001.
Algorithms and Data Strutures for Moving Objects, Summer School on Dynamic Algorithms, University of Paderborn, Paderborn, Germany, 2001.