Klaus Johannsen received his master's degree in theoretical physics from University of Hamburg, Germany in 1992 and his PhD in applied mathematics from Heidelberg University, Germany in 1999. During his PhD period and his post-doc time until 2006 he worked in the interdisciplinary field of scientific computing with environmental scientists from ETH Zurich, Switzerland, TU Delft, Netherland, TU Eindhoven, Netherlands and UT Austin, TX, USA. In 2005 he obtained his professorial degree (habilitation) from Heidelberg University. In 2005 and 2006, he has been assistant professor for mathematics at the Heidelberg University, during 2006 until 2009 adjunct professor for mathematics at Bergen University, Norway. From 2006 until 2019 he worked for the research company Uni Research AS in different roles (chief scientist, group leader, department director). In 2015 he created the Center for Big Data Analysis at Uni Research and operated it until 2019. Since 2019 he is chief researcher at the Norwegian Research Center AS. He is author of 40 scientific publications and supervised 2 master, 2 PhD students and one post-doctoral fellow. He is currently active in the field of data science and machine learning, with focus on uncertainty estimation.