Claes Alén is a Professor at the Division of Geology and Geotechnics, research group Engineering geology and geotechnics. He is a researcher in soils technical properties and its applications. The research is important for a sustainable development of the built environment. Claes collaborates with the Swedish Geotechnical Institutes and the Swedish Transport administration. He is a member of the expert advice boards for the West Link project and the Marieholm Connection project respectively. Claes teaches in soil mechanics, foundation engineering, modeling and risk analysis as well as supervision of Master and Bachelor theses.