His research interests focus on the economics of higher education, notably on markets and privatisation, and the development of human capital as a research program. He is the author "Jacob Mincer - A Founding Father of Modern Labour Economics" (Oxford UP, 2007), which was the first volume of the IZA Prize Series and was awarded in 2009 the Best Book Prize by the European Society of History of Economic Thought. He has also co-edited the following three volumes: "Markets in Higher Education - Reality or Rhetoric?"(Kluwer, 2004), "Cost-Sharing and Accessibility in Higher Education - A Fairer