Joe Mansueto: The simple idea that made me $1bn

Joe Mansueto, the son of an Indiana doctor, was catapulted onto the rich list with the success of his investment research group, Morningstar.

With its shares up by more than 100% since it listed in 2005, the success of investment research group Morningstar has catapulted its founder, Joe Mansueto, 53, onto the rich list. But you wouldn't think his life had changed much. "Sure, I like money for the independence it gives me," says Mansueto in his easy Midwestern drawl. "But as for the material things, I couldn't care." He has only recently bought a new car, having driven an old BMW for seven years. Before that, it was a Mitsubishi Montero with rust holes in the floor panels.

The son of an Indiana doctor, Mansueto's first business venture came in the late 1970s, selling soft drinks from his dorm room at the University of Chicago. "We made $500 a quarter, enough to keep us in beer money." A keen stock analyst, he got interested in the writings of a "guy called Warren Buffett, who was very obscure then", and what made him buy some stocks over others.

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Jody Clarke

Jody studied at the University of Limerick and was a senior writer for MoneyWeek. Jody is experienced in interviewing, for example digging into the lives of an ex-M15 agent and quirky business owners who have made millions. Jody’s other areas of expertise include advice on funds, stocks and house prices.