Markus Fierz ( born 20.06.1912) is a Swiss theoretical physicist. He was born in Basel. He studied in Göttingen and Zurich. In 1936 — 40 he was assistant to W. Pauli at the Zurich Polytechnic, in 1944—60 professor at the University of Basel, and from 1960 at the Zurich Polytechnic.
His work was in the field of quantum field theory, relativity, statistical mechanics and the history of science. In 1939 he gave the spin-statistics theorem in general form, and independently of others proposed a version of quantum field theory. The Max Planck Medal.