Markus Duss is a senior technical expert in mass transfer and hydraulics of structured and random packing at Sulzer Chemtech, Ltd. (Winterthur, Switzerland; Email: Markus.Duss@sulzer.com). He has worked with Sulzer Chemtech as a process engineer for more than 30 years and is a co-author of Distillation: Equipment and Processes (Elsevier, 2014). Duss graduated from the Zürich Univ. of Applied Sciences in Winterthur in 1983.