Robert D. Sard Robert Daniel Sard, a professor emeritus of physics whose work contributed to recent discoveries in particle physics, died after a long illness May 29. He was 78. Sard died at Clark-Lindsey Village's Meadowbrook Nursing Center in Urbana. Sard joined the UI physics department in 1961 and remained there until he retired in 1985. Both before and after his retirement, he was a member of the UI High-Energy Physics Group, which helped plan and develop the experimental facilities at Fermi National Accelerator Laboratory in Batavia. Sard worked as a research associate in particle physics at the Massachusetts Institute of Technology from 1945 to 1946 and then from 1946 to 1961 as a professor at Washington University, St. Louis. During that time he was a Fulbright Fellow at the University of Manchester, England, from 1951 to 1952 and a staff member at Lawrence Berkeley Laboratory in Berkeley, Calif., from 1959 to 1960. While a professor at the UI, Sard participated in a European and Soviet joint research project and lived about 120 miles south of Moscow. He wrote a textbook on special relativity, "Relativistic Mechanics," published in 1980. He was also an associate editor of a newsletter on the history of physics for the American Physical Society from 1985 to 1991. Sard sang with the UI's Oratorio Society. Survivors include two sons, a daughter and one granddaughter.