While many value investors have been influenced by Graham, his most notable investing disciples include Charles Brandes, as well as William J. Ruane, Bert Olden, Irving Kahn and Walter J. Schloss. In addition, Graham's thoughts on investing have influenced the likes of Seth Klarman and Bill Ackman. While some of Graham's investing concepts are now regarded as superseded or outdated, many others are still recognized as important and "Security Analysis" or "The Intelligent Investor" are required reading for new hires at many investing firms around the world.