John Arnold, Houston billionaire & hedge funder, closed up shop last year to focus on his foundation with his wife: http://finance.yahoo.com/news/the-new-scien

John Arnold, Houston billionaire & hedge funder, closed up shop last year to focus on his foundation with his wife: http://finance.yahoo.com/news/the-new-science-of-giving-212647170.html http://finance.yahoo.com/news/the-new-science-of-giving-2126...