• Improving the Performance of Tensor Matrix Vector Product, LANS Seminar, Argonne National Laboratory, March 8, 2005.
• A Scalable Robust Solver for the Diffusion Limited Radiation Transport Equations, SIAM Conference on Computational Science and Engineering, Orlando, USA, February 13, 2005.
• Optimizing Sparse Matrix-Vector Operations on Scalar and Vector Processors, SIAM Conference on Parallel Processing for Scientific Computing, San Francisco, USA, February 25, 2004.
• Understanding the Scalability of an Unstructured CFD Simulation, Scaling to New Heights Workshop at Pittsburgh Supercomputing Center, Pittsburgh, USA, May 20-21, 2002 (with David Keyes).
• Understanding the Performance of Hybrid (distributed/shared memory) Programming Model"  Spring 2001 Seminar Speaker, Department of Computer Science, Old Dominion University, Norfolk, USA, Feb 8, 2001.