Erwin Sonderegger studied classics and philosophy at the University of Zurich, taught greek and latin at the Zurich Freudenberg Cantonal School from 1970 until 2004. He habilitated 1993 with a traduction and commentary on Metaphysics Z of Aristotle (enlarged and revised edition 2012), became Titular professor 2000, taught at the university until his resignation 2007. A traduction with commentary on Metaphysics Λ appeared 2008.