Lars Hörmander

Lars Valter Hörmander was a Swedish mathematician, born in Mjällby in Blekinge on 24 January 1931 and died on 25 November 2012, who has been called the foremost contributor to the modern theory of linear partial differential equations. He began graduate studies at Lund University under Marcel Riesz and finished his Ph.D. in 1955 with a thesis on the theory of general partial differential operators. He worked at Stockholm University, Stanford University and the Institute for Advanced Study in Princeton before returning to Lund University as a professor from 1968 until his retirement in 1996. He was awarded the Fields Medal in 1962 and the Wolf Prize in 1988, and in 2006 the Steele Prize for Mathematical Exposition for his four-volume textbook Analysis of Linear Partial Differential Operators, a foundational work on the subject.