Werner Karl Heisenberg:
(Würzburg, 5 December 1901 – Munich, 1 February 1976).
German physicist and one of the founders of quantum mechanics. Heisenberg’s famous uncertainty relation originated from him. He also made important contributions to work on the hydrodynamics of turbulence, the atomic nucleus, ferromagnetism, cosmic rays and elementary particles and was the designer of the first post-war nuclear reactor at Karlsruhe in Germany.
An expert is someone who knows some of the biggest mistakes that can be made in the subject in question and therefore knows how to avoid them.