Georg Kreisel, known for his work in philosophy of math, has died. Prior to his retirement in 1985, Kreisel held appointments at Stanford, the University of Paris, the University of Reading, and the Institute for Advanced Study. He was a student of Wittgenstein, who is reported to have said that Kreisel was the “most able philosopher he had ever met who was also a mathematician”. According to Wikipedia, Iris Murdoch based several characters in her novels on him. After his retirement, Kreisel wrote biographies, including one of Bertrand Russell and one of Kurt Gödel. He died in his home country of Austria.