Alberto Calderón
Alberto Pedro Calderón was an Argentine mathematician. His name is associated with the University of Buenos Aires, but first and foremost with the University of Chicago, where Calderón and his mentor, the analyst Antoni Zygmund, developed the theory of singular integral operators. This created the "Chicago School of (hard) Analysis".
14 September 1920
Born on the same birth date (14 September 1920): Lawrence Klein • Mario Benedetti
Born on the same birth day (14 September): A. Jean de Grandpré • Callum Keith Rennie • Craig Montoya • Deryck Cooke • Edu Manzano • Gareth Maybin • Ivan Vinogradov • Jessica Brown Findlay • Kepler Wessels • Lee Jong-suk • Michael Crabtree • Nicholas Georgiadis • Paul Allott • Ray Wilkins • Renzo Piano • Robin Singh (cricketer) • Roger Lyons • Shayne Topp
Born in the same month (September 1920): Anders Lassen • Bob Lemon • Clemar Bucci • Else Holmelund Minarik • Eric Baker (activist) • Fabio Taglioni • Feng Kang • Irene Dailey • Jack Warden • Jan Carew • Kym Bonython • Lawrence Klein • Mario Benedetti • Mickey Rooney • Peter D. Mitchell • Richard Farnsworth • Robert Wood Johnson III • Satish Dhawan • Sergei Bondarchuk • Sheila Quinn • Staryl C. Austin • Tereska Torrès • William Conrad