Haakon Fossen is a longstanding professor of Structural Geology at the University of Bergen and has previously worked as an exploration and production geoscientist. His research ranges from hard to soft rocks and is based on field mapping, microscopy, physical and numerical modelling, geochronology, and seismic interpretation. He has authored close to 200 scientific publications and holds the first Nordic Geoscientist Award, a University of Minnesota Distinguished Leadership Award, and an Outstanding Paper Award from the Structural Geology and Tectonics Division of the Geological Society of America, of which he is also a Fellow. Professor Fossen has written several other books and book chapters, including his market-leading Structural Geology (2016)textbook for Cambridge University Press, and has a keen interest in developing electronic resources for teaching and outreach. Christian Teyssier is a professor in the Department of Earth Science at the University of Minnesota and has been a professor of geoscience since 1985. His research interests are structural geology and tectonics, metamorphic geology, geochemistry/geochronology, numerical modelling, orogenic processes such as crustal melting and orogenic collapse as well as oblique tectonics, with an emphasis on field-based observations. He holds a University of Minnesota Distinguished Teaching Award for Outstanding Contributions to Post-Baccalaureate Graduate and Professional Education, and a Best Paper Award from the Structural Geology and Tectonics Division of the Geological Society of America, of which he has been a Fellow. Professor Teyssier has authored/co-authored over 150 scientific publications.