As well as Mary Schweitzer's interesting caveats, I think it's worth pointing out that something of at least as much interest to me is thinkers whose influence was truncated for cultural reasons. This is particularly notable in the case of a number of women economists. Of course, some of their approaches *were* independently rediscovered decades later by white male economists.... But of course truncated influences are, if anything, harder to trace than influences which actually continued to convey their germ down academic generations! Mary Ann [log in to unmask]