Ralph Vince

I suggest reading "The Intelligent Investor" first, otherwise this book can get you confused, or draw you into the risky area of speculative trading.

The book is a bit dense but insightful. It deals more with game theory and day trading, but it is also useful for non-speculative (read: sane) investors. It discusses at length the math of portfolio management and diversification.

Money quote: "Diversification, if done properly, is a technique that increases returns. It does not necessarily reduce worst-case drawdowns. This is absolutely contrary to the popular notion."… (meer)