Who deserves primary credit for founding nuclear engineering: Leo Szilard, who conceived and patented the chain reaction concept in 1933 and 1936, or Enrico Fermi, who led the team that achieved the first actual self sustaining chain reaction in 1942?

Szilard originated and patented the theoretical concept of a nuclear chain reaction years before any working device existed, while Fermi led the team that turned the concept into the first working reactor at Chicago Pile One in 1942 and later jointly held a nuclear reactor patent together with Szilard; historical accounts differ on which contribution defines the founding of the discipline, and Fermi has separately been called the architect of the nuclear age.