Warren Buffett wrote the preface for Graham’s book – The Intelligent Investor – in which he calls it “by far the best book about investing ever written.”

Graham’s first recommended strategy – for novice investors – was to invest in Index stocks.
For more serious investors, Graham recommended three different categories of stocks – Defensive, Enterprising and NCAV – and 17 qualitative and quantitative rules for identifying them.
For professional investors, Graham described various special situations or “workouts”.

Warren Buffett once gave a speech at Columbia Business School explaining how Graham’s record of creating exceptional investors (such as Buffett himself) is unquestionable, and how Graham’s principles are everlasting. The speech is now known as “The Superinvestors of Graham-and-Doddsville”.