On “Parallel implementation of Seismic Modelling Algorithms on PARAM OpenFrame” Department of Physics, Eastern Illinois University, Charleston, USA, October 16, 1997.

On “Waves in Oil Exploration Industry”, Department of Mathematics, Eastern Illinois University, Charleston, USA, October 17, 1997.

Featured talk on  “A predictor-Corrector solver for wave equation based seismic modelling” at IMACS’98: International Conference on Scientific Computing and Mathematical Modelling, Spain, June 1998.

Headed a panel discussion on “Distance Learning in Science and Technology” at Alicante, Spain, June 1998.

Featured talk on “High Performance Computing in Oil Exploration Industry” at an International Conference on Scientific Computing, held at S.N. Bose Institute, Calcutta (India), July 9-11, 1998.

Chaired a panel discussion on “Virtual University ” at Calcutta, India, on July 11, 1998.

Invited lectures under Scientific Computing co-operation activity by the invitation of Istituto Per Applicazioni Della Matematica, Napoli (Italy) for the period June 28, 1998 to July 6, 1998.

Invited talk on “Use of Parallel Computers in Oil Exploration”, at ADCOMP’98: 6th International Conference on Advanced Computing, Pune (India), During December 14-16, 1998

Invited talk on “Parallel Computing in Seismic Data Processing”, at PCAA-99: Workshop on Parallel Computing: Algorithms and Applications, C-DAC, Pune (India), June 21– 25, 1999.

Invited talk on “Direct Numerical Simulation of Incompressible Flow”, at University of Rome “LA SEPINZA”, Rome, Italy, Sept 16, 1999.

Featured Speaker at IMACS’2000: International Conference on Scientific Computing and Mathematical Modelling, University of Wisconsin at Milwaukee, USA, May 25-27, 2000.

Featured talk on “Parallel Scientific Applications on Clusters”, at a conference on Recent Developments in Parallel Computing for Science & Technology, held at Eastern Illinois University, Charleston USA during October 20-22, 2000.

Invited talk on “Solving PDEs for Some Real Problems on Parallel Computers”, at NASA-Ames Research Center, California (USA) under new technology seminar series, August 2, 2001.

Banquet talk on “The GRID”, at a workshop on Parallel Computing and Optimization of Parallel Programs, C-DAC, Pune (India), June, 2002.

Invited talk on “BioGrid: Challenges, Problems and Opportunities”, at conference on Genome Informatics: 10^th FAOBMB Congress, December 2003.