At Leiter Reports there are the results of a poll of the "Most Important Anglophone Philosophers 1945-2000". Over 500 people apparently voted, which is really not that many people. Still, the results, and even the way the poll is set up, are fascinating in several ways.
The first thing that jumps out is that the top 20 people listed went to a very small number of schools. Of course, these philosophers taught, and were educated, at different schools, but here are some of the schools they were at:
Oxford: Armstrong, Anscombe, Austin, Dummett, Grice, Ryle, Sellars, Strawson, Williams
Harvard: Davidson, Kripke, Kuhn, Lewis, Nagel, Quine, Chomsky (Society of Fellows), Putnam (before getting PhD at UCLA)
Princeton: Fodor, Nozick, Rawls
Oxford: Anscombe, Austin, Dummett, Ryle, Strawson
Harvard: Nozick, Putnam, Quine, Rawls
Princeton: Kripke, Lewis, Nagel
MIT: Chomsky, Fodor, Kuhn
Berkeley: Davidson, Grice
When I forget where these philosophers were educated or taught, it can feel as if these philosophers' views are so different, as if they cover the vast expanse of the philosophical landscape. But then when I remember that these twenty philosophers went to a small circle of schools, were in classes with each other, took classes from one another, met each other at the same conferences, then they seem so insular, as if they are just the 20 top bishops of the Anglophone Church, groomed and chosen by from within so as to continue the institutional structures they were a part of.