William Jason Morgan, Princeton University’s Knox Taylor Professor of Geology, Emeritus and a professor of geophysics, emeritus, was a pioneer of the theory of plate tectonics. He died at home July 31.

Harry Frankfurt, professor of philosophy, emeritus, renowned for his scholarship on free will and moral responsibility, died from a number of causes, including congestive heart failure, at a care facility in Santa Monica, California, on July 16, 2023. He was 94.

William “Will” Howarth, professor of English, emeritus, and eminent Thoreau scholar and environmental humanist, died of interstitial lung disease at Penn Medicine Princeton Medical Center on June 6, 2023. He was 82.

Robert Geddes, the founding dean of Princeton’s School of Architecture, the William R. Kenen Jr. Professor of Architecture, renowned urbanist and innovative educator, died on Feb. 13, 2023. He was 99.

Russell Banks, the Howard G. B. Clark ’21 University Professor in the Humanities, Emeritus, and professor of the Humanities Council and creative writing, emeritus, died on Jan. 7, 2023. He was 82.

Robert “Bob” Tignor, the Rosengarten Professor of Modern and Contemporary History, Emeritus, died on December 9, 2022, of complications related to pneumonia at his home in Princeton. He was 89.

Ignacio Rodriguez-Iturbe, the James S. McDonnell Distinguished University Professor of Civil and Environmental Engineering and the Princeton Environmental Institute, Emeritus, died on Sept. 28, 2022

Hildred Storey Geertz, professor of anthropology, emeritus, died peacefully at home in Princeton on September 30, 2022. She was 95.

T. Leslie Shear, Jr., professor of classical archaeology, emeritus, died on September 28, 2022, at Penn Medicine Princeton Medical Center after a brief illness. He was 88.

Daniel Osherson, Princeton’s Henry R. Luce Professor in Information Technology, Consciousness, and Culture, Emeritus and an emeritus professor of psychology, died at home in Princeton on September 4, 2022 from complications due to Parkinson’s. He was 73 years old.