Ryan is a recognised authority on the work of John Stuart Mill, having contributed directly to the ‘Reversionary’ school, which led to a re-examination of Mill’s work from the 1970s. His academic work also takes in broader themes in political theory, including the philosophy of social science, the nature of property, and liberalism of the 19th and 20th centuries.
http://users.ox.ac.uk/~ajryan/
Ryan, A. (2003). The power of positive thinking. New York Review of Books, 50(1), 43-__46.