Randa Duncan Williams

Williams, of Houston is the chair of Enterprise Products Partners, a pipeline giant founded by her late father, Dan Duncan, in 1968. She and her three siblings inherited equal stakes in the company, but Williams has had a more active role, according to Forbes. She joined the family business in 1994 and became president and CEO of Enterprise Products in 2001. Her net worth is $6.3 billion. Daughter of the late Dan Duncan assumed control of part of his $12.4 billion pipeline empire after her father's death March 2010 at age 77. Duncan grew up poor, starting energy company Enterprise Products with 2 trucks in 1968. Today it owns more than 49,000 miles of pipelines. Randa sits on company's board.