Wolfgang Pauli was born in Vienna, a child prodigy: at 18, he wrote a review article on the theory of relativity that was highly praised by Einstein. He studied under Sommerfeld in Munich, worked with Born in Göttingen and with Bohr in Copenhagen. In 1925, he discovered the exclusion principle, for which he received the Nobel Prize (1945). In 1930, to explain beta decay, he introduced the neutrino hypothesis. He taught in Hamburg, Zurich (ETH), and Princeton. He was known for his sharp intellect, uncompromising criticism, and the mystical 'Pauli effect'.