Invited Lecture on the Discovery of Secondary Solitary Waves and on Granular Shock Mitigation - Southern Workshop on Granular Materials 2006, Renaca, Chile, September, 2006

Dynamics in Granular Assemblies - Colloquium in Mechanical Engg at California Institute of Technology, May, 2005.

Studies on a generalizedequilibrium state - Lecture on quasi-equilibrium state at the 8th Latin American Workshop on Nonlinear Physics, Bahia, Brazil, 2003

Plenary Lecture at Army Workshop on Soils, Santa Fe - Lecture on shallow soil work, 2003

Seminar at Army Research Lab, Lecture on shock absorption work, Aberdeen Proving Ground, MD, 2005

Dust flow through air - Lecture on dust accumulation in filters at Dust Workshop, NASA Cleveland, 2003

Science Education and Professional Development in Rural Schools - Lecture at International Conference on Physics Education, New Delhi, 2005

Space Exploration, Mars Mission and Physics - Lecture at the Gifted Math Program (8th graders), Graduate School of Education, SUNY at Buffalo, March 22, 2006