 In the 1920s Wittgenstein, now divorced from philosophy (having, to his mind, solved all philosophical problems in the Tractatus), gave away his part of his family’s fortune and pursued several ‘professions’ (gardener, teacher, architect, etc.) in and around Vienna. It was only in 1929 that he returned to Cambridge to resume his philosophical vocation, after having been exposed to discussions on the philosophy of mathematics and science with members of the Vienna Circle, whose conception of logical empiricism was indebted to his Tractatus account of logic as tautologous, and his philosophy as concerned with logical syntax. During these first years in Cambridge his conception of philosophy and its problems underwent dramatic changes that are recorded in several volumes of conversations, lecture notes, and letters (e.g., Ludwig Wittgenstein and the Vienna Circle, The Blue and Brown Books, Philosophical Grammar, Philosophical Remarks). Sometimes termed the ‘middle Wittgenstein,’ this period heralds a rejection of dogmatic philosophy, including both traditional works and the Tractatus itself.