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Wilder Penfield was one of Canada's greatest scientists, a man who combined skill as a surgeon with an insatiable curiosity about the inner workings of the human mind. Four times nominated for the Nobel Prize, Penfield was known around the world for his pioneering discoveries and daring surgical techniques. With access to diaries and private family papers, Penfield's grandson, Jefferson Lewis, has written a frank, courageous account of a fascinating and complex man.