The last issue of Storia del Pensiero Economico N.S. includes the written version of Frank Hahn's talk at the first Siena Meeting in the History of Economic Thought, a meeting preparatory to the foundation of the European Society for the History of Economic Thought. The conference was held at the Certosa of Pontignano near Siena, Italy, on September 15-16, 1995. Hahn's talk, titled "General Equilibrium for Intellectual Historians," dealt with the historical origin and contemporary significance of general equilibrium. Although the substance of his thesis was already familiar to those acquainted with his writings, the candid and straightforward way in which he addressed an audience including many intellectual historians sparked a lively discussion. In particular Donald Winch commented that, in spite of Hahn's effort to provide a more elaborate view of Adam Smith than that presented in his classic article "Reflections on the Invisible Hand," Hahn's interpretation was still one-sided. A revised version of Winch's talk at the Siena meeting was published in the Scottish Journal of Political Economy two years later, but Hahn's talk remained unpublished. On the occasion of Frank Hahn's 80th birthday, which was celebrated at Churchill College, Cambridge, in May 2005, it seemed appropriate to ask Frank Hahn permission to publish the written version of the talk, and to introduce it by an interview on the current state of economic theory. The interview, conducted in January 2005, is reproduced at the following web-site, intended to honour Frank Hahn: http://www.econ-pol.unisi.it/hahn/welcome.htm Carlo Zappia