Arnab Chakrabarty is a Consultant at Process Systems Enterprise. Previously he has worked as a Process Technology Engineer at MEMC Electronic Materials and as a Project Consultant/Scientist, for Baker Engineering and Risk Consultants, Inc.M. Sam Mannan†, PhD, PE, CSP, was a chemical engineering professor and director of the Mary Kay O'Connor Process Safety Center at Texas A&M University. He was an internationally recognized expert on process safety and risk assessment. His research interests included hazard assessment and risk analysis, flammable and toxic gas cloud dispersion modeling, inherently safer design, reactive chemicals and run¬away reactions, aerosols, and abnormal situation management.Tahir Cagin is a Professor at Artie McFerrin Department of Chemical Engineering, Texas A&M University.