Anders Olof Gunnar Källén (13 February 1926 – 13 October 1968) was a Swedish theoretical physicist and professor at Lund University, known for his work on correlation functions in quantum field theory.
[2] His father, Yngve Källén, was a teacher of physics and mathematics, and together they published a paper on the theory of relativity.
[2] Källén earned his doctorate at Lund in 1950 working with Torsten Gustafson, who was in close correspondence with Wolfgang Pauli.
[6] He was flying a Piper PA-28 Cherokee Arrow from Malmö to CERN when his plane crashed during an emergency landing in Hanover, Germany in 1968.
[8] Steven Weinberg, whose first published physics paper was motivated by Källén, wrote one of the book's chapters.