Freud The Key Ideas is the smartest way to discover the life and work of Sigmund Freud, one of the twentieth century's most influential thinkers. It explains his complex ideas in simple terms, backing it up with references to his own texts. From his upbringing and the early development of his thinking, through his early work and influences, all the intriciacies of Freud's complex systems of thought are discussed in a straightforward and jargon-free way.