Barbara Lothenbach is group leader of the Cement Chemistry and Thermodynamics Group of the Concrete & Asphalt Laboratory at Empa, the Swiss Federal Institute for Materials Science & Technology. She has graduated for ETH Zürich and now is associate professor at University Berne, Switzerland, and adjunct professor at NTNU, Norway. She plays an active role in the promotion of the use of thermodynamic modelling to predict and understand the composition of hydrated cement, fundamental to develop durable and low CO2-cements.