Steve Pyke has photographed more than 200 philosophers over the last 20 years:

Most philosophers have spent their entire lives in intense concentration, developing and defending lines of argument that can withstand the fearsome critical scrutiny of their peers. Perhaps this leaves some mark on their faces; to that I leave others to judge.

His NYT gallery is here. His older personal website galleries are here and here.

(Image of Sir Isaiah Berlin, London, 14 June 1990 )