Roman Wladimir Jackiw[a] (/roʊˈmæn dʒæˈkiːv/; November 8, 1939 – June 14, 2023) was a Polish-born American theoretical physicist and Dirac Medallist.

[2] Jackiw earned his undergraduate degree from Swarthmore College and his PhD from Cornell University in 1966 under Hans Bethe and Kenneth Wilson.

In 1969, he and John Stewart Bell published their explanation, which was later expanded and clarified by Stephen L. Adler, of the observed decay of a neutral pion into two photons.

Their introduction of an "anomalous" term from quantum field theory required that the sum of the charges of the elementary fermions had to be zero.

His daughter, Simone Ahlborn, is an educator at Moses Brown School in Providence, Rhode Island.