Ludwig Wittgenstein remains one of the most powerful influences on contemporary philosophy, yet he shunned publicity and was an extremely private man. His friend Norman Malcolm (himself an eminent philosopher) wrote this remarkably vivid personal memoir of Wittgenstein--first published in 1958 to wide acclaim for its moving and truthful portrait of the gifted yet difficult man. And, although much has been published about Wittgenstein since his death, nothing brings us closer to the philosopher himself than this modest classic. Now in a new edition, it includes the complete text of the fifty-seven letters that Wittgenstein wrote to Malcolm over a period of eleven years, revealing how friendship deeply mattered to Wittgenstein: he advises, warns, jokes, and is grateful and affectionate. The volume also features a concise biographical sketch by Georg Henrik von Wright, another leading philosopher and friend of Wittgenstein.