Roger Lowenstein is now a director at Sequoia Fund, founded by the legendary Bill Ruane, but he shot to fame with his first book Buffett: The making of an American Capitalist in 1995. Robert Hagstrom’s The Warren Buffett Way was the first detailed tome on Buffett’s investment style but Lowenstein’s book, which followed soon after, was personally more revealing. His book is also the one that many an investor mentions when recalling their initiation to Buffett. Though Lowenstein is a Berkshire shareholder, he is unsure about whether tech giant IBM should be in the conglomerate’s investment portfolio.