Gian Carlo Wick (15 October 1909 – 20 April 1992) was an Italian theoretical physicist who made important contributions to quantum field theory.

Wick refused to subscribe to a controversial oath[5] during the McCarthy era, so he was fired at Berkeley and went to the Carnegie Institute of Technology in Pittsburgh in 1951.

[1] As a member of Fermi's group in Rome, Wick calculated the magnetic moment of the hydrogen molecule with group-theoretical methods.

He joined a group of Italian physicists led by Gilberto Bernardini which made the first measurement of the lifetime of the muon.

[1] He also introduced the Wick rotation, in which computations are analytically continued from Minkowski space to four-dimensional Euclidean space using a coordinate change to imaginary time[6] He developed the helicity formulation for collisions between particles with arbitrary spin, worked with Geoffrey Chew on the impulse approximation, and worked on meson theory, symmetry principles in physics, and the vacuum structure of quantum field theory.