Myles Burnyeat (1939-2019) was a major figure in the study of ancient Greek philosophy during the last decades of the twentieth century and the first of this.After teaching positions in London and Cambridge, where he became Laurence Professor, in 1996 he took up a Senior Research Fellowship at All Souls College, Oxford, from which he retired in 2006.In 2012 he published two volumes collecting essays dating from before the move to Oxford.Two new posthumously published volumes bring together essays from his years at All Souls and his retirement, some of which have hitherto been unpublished.Volume 3 introduces Plato's Republic and examines his subsequent interpretation, and shows how ancient philosophical thinking can be applied to contemporary questions about key philosophical and psychological topics.Volume 4 focuses on Plato's and Aristotle's handling of important concepts in epistemology, metaphysics and science, and introduces the early history of Greek optics.