Houston billionaire John Arnold, who rose to prominence at now defunct energy trader Enron, is now a champion of climate philanthropy. His investments in Houston-based companies such as Grid ...

WORLD'S WEALTHIEST: Texas millionaires are on ... including Houstonians Jim Crane and John Arnold, both of whom missed the cutoff for this year's Forbes 400 list.

He then founded hedge fund Centaurus Advisors, which, according to Forbes, is the primary source of the couple's wealth. In 2012, Arnold and John made the decision to dedicate their lives to ...