Wow, I've read Hart's The Concept of Law and his lecture Law, Liberty, and Morality; they're quite good. It's interesting to hear about the early intellectual lives of now-famous philosophers. I'ts a shame there are so few (any?) biographies of 20th century philosophers.
Aren't there plenty of biographies? Of Sartre, Foucault (more than one), Wittgenstein, Russell, Heidegger, off the top of my head. I'm sure there are others.
Comment retracted. Maybe revised to the solipsistic statement, "There are no biographies of any of the extremely few 20th century philosophers Michael has looked for."
Hilarious. Someone ought to compile an anthology of digs at AC Ewing. Apparently Wittgenstein used to rag him mercilessly, e.g., starting a discussion of the problem of other minds by saying, "suppose-- purely for the sake of argument, of course-- that Ewing has a mind..."