children birth_place name birth_date spouse article_title birth_name occupation
3 dallas , texas john d. arnold 1974 laura muñoz john d. arnold
 john douglas arnold investor , former hedge fund manager
john d. arnold

john douglas arnold -lrb- born 1974 -rrb- is an american billionaire and former hedge fund manager who specialized in natural gas trading .
his firm , centaurus advisors , llc , was a houston-based hedge fund that specialized in trading energy products .
arnold announced his retirement from running the hedge fund on may 2 , 2012 .
