In an interview with Business Insider, Validea CEO John Reese discusses his Warren Buffett-based investing strategy, which is up more than 50% in the last year. Reese also talks about his other Guru Strategies, which are based on the writings of such investing greats as Martin Zweig, Peter Lynch, David Dreman, and Benjamin Graham. And he discusses the importance of discipline for investors, and why he thinks the gurus’ approaches will continue to work in the future.