Leonid F. Khilyuk, Ph.D., is a consultant in mathematical modeling of environmental processes at the University of Southern California, former Chairman of the Department of Computer Sciences and Applied Mathematics in the Kiev Technological University. He has over 100 publications worldwide in Mathematical Modeling of Environmental Processes, Control Theory, Probability and Statistics.John O. Robertson Jr, Ph.D., P.E., has over 30 years experience in the area of petroleum and environmental engineering. He has co-authored over 9 books and 20 articles in leading scientific journals. He has been awarded three gold medals and many international honors for his work. He has served as president of Earth Engineering, Inc., for the past 20 years.Bernard Endres, Ph.D., is an environmental consultant specializing in the fields of oil and gas migration, geological site characterization and evaluation of chemicals and gas constituents relating to source identification within the earth's geological structure. His scientific publications have included the environmental hazards associated with oil and gas migration.