 There is not room here to discuss each of Alexander’s commentaries individually. Some remarks on his treatment of Aristotle’s logic in his commentary on Prior Analytics I can serve the purpose of a general survey (cf. the Introduction in trsl. Barnes et al. 1991). As his explanations show, Alexander was fully familiar with the development of logic after Aristotle, under Theophrastus and the Stoics. On the whole, he presents the Aristotelian kind of logic as the obviously right one, treating the Stoic approach as wrong-headed. When he confronts problems in Aristotle’s syllogistic he sometimes expresses bafflement, and indicates the difficulties or even inconsistencies he sees in the text. But he usually tries to smooth them over or offers an alleged Aristotelian solution. In any case he avoids, if at all possible, openly criticizing Aristotle or contradicting him. As his analyses show, Alexander was not an original logician with innovative ideas of his own, as was his contemporary, Galen. He does not always get Aristotle right and sometimes blunders in his exegesis. In addition, his style is uninviting. If Aristotle is hard to comprehend on account of his clipped and elliptic style, Alexander is often hard to follow because of his long and tortuous periods. In the past this has made his commentary on the Prior Analytics inaccessible to all but experts. The English translations try to make up for these deficiencies by cutting up long periods into shorter sentences. This will greatly enhance the usefulness of Alexander’s reconstruction and assessment of those aspects of Aristotle’s logic that are still a matter of controversy nowadays.