Donald Hartill, a Cornell physicist whose five-decade career shaped high-energy research and community life in equal measure, died April 16 at the age of 86.
A professor emeritus in the College of Arts and Sciences, Hartill was a central figure in advancing Cornell’s physics infrastructure. He also served for 25 years as mayor of the Village of Lansing, where his steady civic leadership earned widespread respect.
At Cornell, Hartill helped design and operate the Cornell Electron Storage Ring (CESR), was instrumental to the CLEO high-energy physics program, and played a key role in developing the Cornell High Energy Synchrotron Source (CHESS). Colleagues credit him with extending CESR’s life through his design of a uniquely tunable magnet system.
“Don’s steady leadership – especially during times of uncertainty – left an enduring mark on the culture and strength of Cornell’s physics community,” said Ritchie Patterson, professor of physics and former director of CLASSE.
Hartill joined Cornell in 1968 after earning degrees from MIT and Caltech and conducting postdoctoral research at CERN. His early work on high-energy photon and electron beam experiments laid the foundation for decades of innovations in detector design and accelerator technology.
“Many of us used the chambers and electronics that Don developed,” said David Cassel, professor emeritus and CLEO collaborator. “He made essential contributions to the CLEO detectors.”
Hartill also contributed to international research efforts, holding visiting appointments at institutions including SLAC and Italy’s Osservatorio Astrofisico di Arcetri. He was named a fellow of both the American Physical Society and the American Association for the Advancement of Science.
At Cornell, Hartill worked closely with the superconducting radio frequency (SRF) group, helping pioneer new diagnostics and even building what may have been the world’s largest SRF cavity. “Don’s kindness, broad technical knowledge, and his seemingly unlimited availability to listen and help made Don such a wonderful leader,” said Matthias Liepe, head of Cornell’s SRF group.
Even after retirement in 2016, Hartill remained deeply involved in Cornell’s research community, becoming director of CLASSE in 2020. During the onset of the COVID-19 pandemic, his leadership helped reopen the lab safely and efficiently.
Outside the university, Hartill was equally dedicated to public service. He served as mayor of the Village of Lansing for 25 years, beginning in 1989. He also held advisory roles with national scientific organizations, including the NSF, Department of Defense, Fermilab, CERN, and LIGO. He was especially proud of his oversight work with the U.S. Antarctic Program and traveled to the continent numerous times.
“Thanks to his clear-eyed decision-making, deep institutional knowledge and commitment to safety, the lab navigated the crisis with minimal disruption,” said Patterson. “He helped CLASSE move forward with clarity and confidence.”
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