Professor Hart, well-known for his work in philosophy of mathematics and philosophical logic, was emeritus at the University of Illinois at Chicago, where he taught for nearly two decades, after a comparably long stint at University College London. This is from the UIC memorial notice:

The philosopher W. D. Hart, age 83, died in Mexico City, Mexico, on March 5, 2026, after a long struggle with prostate cancer and kidney disease. Always known as Bill, he was born Wilbur Dyre Hart III in Ithaca NY on Feb. 18, 1943….He was educated at Harvard University (AB summa cum laude, Phi Beta Kappa, 1965; PhD 1968) and taught philosophy for 5 years at the University of Michigan before spending 17 years at University College London, with visiting positions at the University of Pennsylvania and Cambridge University. He then taught briefly at the University of New Mexico before moving in 1993 to the University of Illinois Chicago, where he became chair of the philosophy department for 12 years and from which he retired in 2011. His main areas of interest were philosophical logic and the philosophy of mathematics. In addition to numerous articles, his books include The Engines of the Soul (Cambridge, 1988), The Evolution of Logic (Cambridge, 2010), and Readings in the Philosophy of Mathematics, ed. (Oxford, 1996). 

Comments are open for remembrances from those who knew Professor Hart or for those who would like to comment on the significance of his work.