John Dalgleish Donaldson, a Scottish–Australian mathematician and professor, died on April 12, 2026, at the age of 84.
Death was announced on that date. Born on September 5, 1941, in Cockenzie and Port Seton, Scotland, he later emigrated to Tasmania, Australia, with his first wife, Henrietta Clark Horne, whom he married in 1963.
Donaldson was the father of Queen Mary of Denmark, the wife of King Frederik X of Denmark.
John Dalgleish Donaldson, 84, Scottish-Australian mathematician. (death announced on this date)