Joining him in the top 10 are the psychologists Steven Pinker (3) and Daniel Kahneman (10), the economists Paul Krugman (5) and Amartya Sen (7) and the philosopher Slavoj Žižek (6), who all, like him, figured in the magazine's first list of world-class thinkers in 2005.
A late run by the octogenarian British physicist Peter Higgs (8) secured him a place in an elite squad containing three other scientists, while the remaining slots are taken by academics turned politicians from the Middle East: Afghanistan's Ashraf Ghani (2), an economist who served as finance minister after the US-led invasion; Iraq's Ali Allawi (4), another ex-minister and author of The Occupation of Iraq and The Crisis of Islamic Civilization; and Egypt's Mohamed ElBaradei (9), prominent in the Arab Spring and now in opposition to Mohamed Morsi.
To qualify for this year's world thinkers rankings, it was not enough to have written a seminal book, inspired an intellectual movement or won a Nobel prize several years ago (hence the absence from the 65-strong long list of ageing titans such as Noam Chomsky or Edward O Wilson); the selectors' remit ruthlessly insisted on "influence over the past 12 months" and "significance to the year's biggest questions".
This requirement may have been a factor in the top 10 being all-male (presumably a source of frustration to the five women on the selection panel, including Prospect's editor Bronwen Maddox), with longlistees such as Hilary Mantel, Martha Nussbaum and Sheryl Sandberg not making it through to the elite of the elite, and the likes of Germaine Greer and Naomi Klein not even making it into the 65. But it may also, of course, simply reflect the gender make-up of the monthly's readership.