Klaus Hasselmann

Klaus Ferdinand Hasselmann (born 25 October 1931) is a German oceanographer and climate modeller. He is Professor Emeritus at the University of Hamburg and former Director of the Max Planck Institute for Meteorology. He was awarded the 2021 Nobel Prize in Physics with Syukuro Manabe and Giorgio Parisi.
He is best known for creating the "Hasselmann model". His works has helped track and model the effects and weather patterns of climate change.