Hermann Haken

Hermann Haken (12 July 1927 – 14 August 2024) was a German physicist and professor emeritus in theoretical physics at the University of Stuttgart. He is known as the founder of synergetics and one of the "fathers" of quantum-mechanical laser theory. He is a cousin of the mathematician Wolfgang Haken, who proved the Four color theorem. He was a nephew of Werner Haken, a doctoral student of Max Planck. Provided by Wikipedia