Mathias Horstmann, Schlumberger, is Principal Domain Petrophysicist for Scandinavia, based in Stavanger. Mathias is member of SPE and SPWLA and held for 4 years the position as VP Program of the Norwegian Formation Evaluation Society before he took chair in 2016 which he hed until 2023. He received degrees in Geology and Mineralogy from the University of Freiburg, Germany and worked for a period in the coal and ore mining industry. He then joined Schlumberger in 2002 as a field engineer providing open hole logging services in Europe and Africa. He worked in management positions and held various petro-technical positions in Asia and Europe.