Randa Williams | Net worth: $6 billion

Source: Enterprise Products Partners

Randa Duncan Williams is a wealthy American heiress born to Barbara Ann Duncan and Dan Duncan, a co-founder of Enterprise Products. As the inheritor of a large fortune, Randa and her three siblings own an 8% interest in the family firm. She and her husband, Charles Williams, have one child and live in Houston.

She graduated from Rice University with a bachelor’s degree and a JD from the University of Houston. She worked for Butler & Binion and Brown, Sims, Wise & White after graduation. From 1994 to February 2001, Williams founded and became the chief executive officer (CEO) of Enterprise Products and vice president of Enterprise Products. When her father passed, she inherited $3.1 billion. Duncan, along with her siblings, is one of the first American billionaires to pay no estate tax since the law’s implementation, thanks to a temporary repeal in the estate tax statute for the year 2010. She bought Texas Monthly in 2019.