Dr. Marja-Liisa Siikonen (née Jokela), PhD, is the CEO of MLS Lift Consulting. Earlier she worked as a Director of People Flow Planning in KONE Corporation, Finland. She received her M.Sc. in technical physics, and Lic.Sc. (Tech.) and D.Sc. (Tech.) degree in applied mathematics from the Helsinki University of Technology. She has published around 100 articles and holds 250 patents in the field of elevator control systems and energy consumption, elevator traffic planning, building traffic simulation and evacuation, and people flow in buildings.