 William of Sherwood was born between 1200 and 1205, probably in Nottinghamshire, and died between 1266 and 1272. His school career is uncertain, but given references to his works and his influence on people such as Peter of Spain, Lambert of Auxerre, Albert the Great, and Thomas Aquinas, it is likely that he was teaching logic at the University of Paris between 1235 and 1250. After that period, he seems to have left logic. He was a master at Oxford in 1252 and treasurer of the cathedral of Lincoln about two years later; still later, he was rector at Aylesbury, in Buckinghamshire, and Attleborough, in Norfolk. He was still alive in 1266 but dead by 1272 (Kretzmann 1968, p. 3).