John Michael Boardman (13 February 193818 March 2021) was a mathematician whose speciality was algebraic and differential topology. He was affiliated with the University of Cambridge, England and the Johns Hopkins University in Baltimore, Maryland. Boardman was most widely known for his construction of the first rigorously correct model of the homotopy category of spectra. He received his PhD from the University of Cambridge in 1964. His thesis advisor was C. T. C. Wall. In 2012 he became a fellow of the American Mathematical Society. He died on 18 March 2021. Selected publications References Further reading External links Alumni of the University of Cambridge 20th-century American mathematicians 21st-century American mathematicians 20th-century British mathematicians 21st-century British mathematicians Johns Hopkins University faculty Fellows of the American Mathematical Society 2021 deaths Topologists 1938 births