Grant S. Heffelfinger, PhD, is Deputy Director for Materials Science and Technology in the Materials and Process Sciences Center at Sandia National Laboratories, Albuquerque, NM. His graduate research in molecular physics led to a PhD in Chemical Engineering from Cornell University in 1988. Since that time, he has held various staff and management positions at Sandia National Laboratories. His research achievements include co-inventing the dual control volume molecular dynamics simulation method for modeling diffusion in molecular systems with chemical potential gradients, such as diffusion through membranes. He was the principal author and technical leader for "Accelerating Biology with Advanced Algorithms and Massively Parallel Computing," a Cooperative Research and Development Agreement (CRADA) between Sandia National Laboratories and Celera Genomics signed January 19, 2001. He is also the Principal Investigator of "Carbon Sequestration in Synechococcus Sp.: From Molecular Machines to Hierarchical Modeling," one of five initial awards recently announced by the US DOE Office of Science’s Genomes to Life Program.