Joel Greenblatt is founder and managing partner of Gotham Capital, founder of the New York Securities Auction Corporation and the online Value Investors Club, and adjunct professor at Columbia University Business School. Greenblatt started as a pure value investor, drawn to companies that appeared cheap, but was later influenced by Warren Buffett's view that growth is part of the value equation. He is author of You Can Be a Stock Market Genius (http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2FYou-Can-Stock-Market-Genius%2Fdp%2F0684840073%3Fie%3DUTF8%26s%3Dbooks%26qid%3D1177324873%26sr%3D1-2&tag=seekingalpha-20&linkCode=ur2&camp=1789&creative=9325), The Little Book That Beats the Market (http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2FLittle-Book-That-Beats-Market%2Fdp%2F0471733067%3Fie%3DUTF8%26s%3Dbooks%26qid%3D1177324873%26sr%3D1-1&tag=seekingalpha-20&linkCode=ur2&camp=1789&creative=9325), and A Capital Offense: A Hedge Fund Manager's Struggle for Justice and the Allied Capital Scandal (http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2FCapital-Offense-Managers-Struggle-Justice%2Fdp%2F0470073942%3Fie%3DUTF8%26s%3Dbooks%26qid%3D1177324873%26sr%3D1-3&tag=seekingalpha-20&linkCode=ur2&camp=1789&creative=9325).

Using the "Magic Formula" for investing, described in his book, Greenblatt has seen annual returns of over 30% by ranking stock based on return on capital and a high earnings yield (based on his estimate of normalized earnings).