Arthur Etchells Arthur W. Etchells is a world recognized authority in the field of fluid flow and mixing for the process industries. He is a chemical engineer with BS and MS from University of Pennsylvania and doctorate from University of Delaware. For thirty nine years he worked for the DuPont Company and for thirty years as an internal consultant for the many diverse DuPont businesses in the field of fluid flow with emphasis on mixing and slurry transport. He has achieved the highest technical level of DuPont Fellow and the highest technical award, the Lavoisier Medal. His outside activities such as teaching in universities and continuing education courses, publications, and lectures and his leadership in the world technical community have made him widely known and highly respected. He has contributed two chapters to the Handbook of Industrial Mixing (Wiley 2004) and is an editor for Advances in Industrial Mixing (Wiley 2015) a companion volume. He is a past president of the North American Mixing Forum and winner of their award for contribution to mixing technology.