> I can't think of any "modern" philosopher whose work was so revolutionary that it broke completely from the philosophical traditions started in ancient Greece

> I can't think of any "modern" philosopher whose work was so revolutionary that it broke completely from the philosophical traditions started in ancient Greece and the near east. I'd say it comes down to the split between the Continental and Analytic schools. Russel and Wittgenstein come to mind. They represented a radical departure from, and rejection of Continental philosophy which was rooted in metaphysics and descended directly from Socrates. Personally, I'd make the distinction around that time-frame.