Velkley's writing treats questions about the status of philosophic reason and its relation to society and politics since the late 18th century: the principles of Enlightenment thought and their revision, criticism and sometimes complete rejection; conceptions of freedom and their role in attempts to address social and psychic division and alienation; the turn to aesthetic experience and aesthetic education; criticisms of modernity inspired by ancient thought; the meaning and the consequences of the historical turn in modern philosophy; accounts of crisis in the philosophical tradition and critical analyses of the grounds of the tradition. He conceives the study of the history of philosophy as a way to become aware of persisting perplexities in human life that remain unresolved in the modern period. His historical inquiry starts from Rousseau's criticism of modern philosophy and considers responses of later thinkers to it, in the first place Kant. He has lectured widely in the U.S. and abroad on these topics. In Velkley’s account, Rousseau is not a sentimental thinker of natural contentment but the initiator of a problematically dialectical conception of human reason. Human perfectibility, chiefly through the invention of speech, expands desires beyond immediate needs, creating new desires for luxuries and unattainable goods. Reason is the root of human self-alienation, the loss of equilibrium between cognitive faculties and desires, for which Rousseau offers various remedies. With this thought he influenced Kant in ways that go beyond the widely-recognized kinship of Kantian autonomy with Rousseau’s general will. Kant is awakened by Rousseau in the 1760s to a crisis in modern civilization ; he then finds in freedom a unifying standpoint beyond nature to counter the chaos of artificial desires. Rousseau continues to exert a powerful pull on European philosophy, partly through Kant, by his interpretation of the modern self in terms of the dialectical striving of an antinomic reasonseeking unity with itself. This striving, in various guises, is the central plot of human history in numerous post-Kantian philosophers.