Per Claesson is professor in Surface Chemistry at the Royal Institute of Technology, KTH, Stockholm. He started his scientific career as PhD-student at KTH and during that time he enjoyed learning about surface forces during a one-year visit to The Australian National University. Studies of surface forces have remained a central theme since that time. He has led several large collaborations involving academic and industrial partners, such as the competence centre “Surfactants Based on Natural Products” and the program on “Microstructure, Corrosion and Friction”. He has published more than 300 scientific articles and 20 book chapters, and his work has been cited more than 10.000 times. His research activities have been awarded by the AkzoNobel Science Award in 2013 and by the Arrhenius medal in 2008.