Dr Hayder Abdul-Razzak is a professor of mechanical engineering at Texas A&M University-Kingsville. He has over 25 years of experience with a Ph.D. from the Illinois Institute of Technology. An expert in atmospheric chemistry and physics, he is proficient in the design, analysis, and modeling of fluid and thermal systems. Dr Razzak has published numerous research projects in refereed journals. For the past twenty years, Dr Razzak has been involved with a research project supported by NASA and DOE to investigate the impact of aerosols on the atmosphere, in collaboration with Pacific Northwest Laboratory. His treatment of aerosol activation has been selected for incorporation into the Community Climate System Model and many other regional and global climate models.