A. Eduardo Sáez is a distinguished professor in the Department of Chemical and Environmental Engineering and an adjunct professor in the Mel and Enid Zuckerman College of Public Health at the University of Arizona, Tucson, USA. He holds a B.Sc from Simón Bolívar University, Caracas, Venezuela, and an MS and Ph.D from the University of California at Davis, USA. Dr. Sáez has been a faculty member at Simón Bolívar University and North Carolina State University, Raleigh, USA, and a visiting scholar at Bristol University, UK, and Pacific Northwest National Laboratory, Richland, Washington. He has earned numerous awards for his research and teaching. James C. Baygents is the associate dean for academic affairs in the College of Engineering at the University of Arizona (UA), Tucson, USA. He is also a member of the Department of Chemical and Environmental Engineering and the Program in Applied Mathematics at UA. He holds a BS from Rice University, Houston, Texas, USA, and an MA and Ph.D from Princeton University, New Jersey, USA. Dr. Baygents has been a visiting scientist and research fellow at the Space Science Laboratory at the NASA Marshall Space Flight Center, Huntsville, Alabama. He has earned numerous awards and received recognition for his research and teaching.