In a nutshell, Kay argues that academic leadership is not just about scholarly ability, it requires sustained effort in creating a school of thought and the ability to draw followers- in other words,
perseverance as well as human qualities. Otherwise, you remain a renowned scholar, not the founder of a school of thought.
Here's Kay's take on Schumpeter and Keynes.
Schumpeter rivalled Keynes in range of experience and subtlety of thought, and surpassed him in breadth of scholarship. But his impact on intellectual life and practical affairs was slight compared with that of his English rival......As for the contest between Friedman and Galbraith, in terms of lasting impact, there was no contest- Friedman has won hands down.Schumpeter knew that his rival’s work had far greater influence. His critical essay on Keynes in History of Economic Analysis both displays his bitterness and identifies the reasons for Keynes’s greater success. Schumpeter expresses genuine admiration for the courageous publication of The Economic Consequences of the Peace. Keynes was, Schumpeter recognises, a natural leader who gave others confidence and inspiration.
Schumpeter would observe of himself: “I singularly lack the quality of leadership – with a fraction of my ideas a new economics could have been founded.” That new economics did not happen. There would be a Keynesian school, a Keynesian economics, but no Schumpeterian school, and really no Schumpeterian economists.
What about Amartya Sen, Joseph Stiglitz and Paul Krugman, today's reigning gurus?In the generation that followed Keynes and Schumpeter, John Kenneth Galbraith (born 1908) and Milton Friedman (born 1912), were the two most prominent public intellectuals among economists. If Schumpeter is more admired than read, Galbraith is more read than admired.....
Like Schumpeter, Galbraith never had time or inclination for the university and the gift for dry, academic observation which was his stock in trade was best deployed in perpetual opposition. If Schumpeter lacked qualities of leadership, Galbraith chose not to exercise them.
The method of dissemination of the Chicago school (led by Friedman) was similar to that of the Keynesians: a relatively simple ideological message for communication to the world outside; a new, difficult, yet extensive theoretical framework; and a dedicated band of supporters who would entrench the doctrine in other economics departments.
Sen is, in a natural sense, the Schumpeter of our times. He shows a breadth of erudition and subtlety of mind unparalleled among other economists. But, like Schumpeter, Sen is an isolated figure. There will be no Sen school. Nor, it would seem, will there be a school of Stiglitz: a generation of students looks for a counterweight to Chicago, but the school’s potential leader has not found the application to develop a coherent and comprehensive critique that such a leadership role would today require, or the aptitude or inclination for academic
politics. And the dissonance between Paul Krugman as polemical columnist at The
New York Times, and his professional work at Princeton, seems too great.