Jonathan L. Rosner *65

Jon died May 24, 2025, in Chicago.

Born in New York July 23, 1941, Jon did his undergraduate work at Swarthmore, graduating in 1962, and earned a Ph.D. in physics from Princeton in 1965.

He was a postdoc at the University of Washington, a lecturer at Tel Aviv University, and a professor at the University of Minnesota before serving as a professor at the Enrico Fermi Institute at the University of Chicago, where he researched and taught for 43 years, retiring in 2011.

Jon’s expertise was in high-energy particle physics and standard model and flavor physics. His publications include papers in the fields of theoretical physics, experimental physics, and molecular biology. He had visiting appointments at Caltech, the Institute for Advanced Study, Cornell, and the University of Tokyo, and was a member of the board of trustees of the Aspen Center for Physics.

In 2013, Jon chaired the division of particles and fields of the American Physical Society, when much of his time was devoted to a long-range planning exercise for the U.S. high-energy physics program Snowmass on the Mississippi.

Jon is survived by his wife of 60 years, Joy; children Hannah and Ben; and granddaughter Sadie.

Graduate alumni memorials are prepared by the APGA.