Randa Duncan was born in 1962. Her Father, Dan Duncan, was the co-founder of Enterprise Products.
After school, she practiced law with Butler & Binion and Brown, Sims, Wise & White. Williams served as the President and chief executive officer (CEO) of Enterprise Products and vice President at Enterprise Products from 1994 to February 2001.
Williams is a member of the board of trustees for the Houston Zoo, was a member of the board of trustees for the Houston Museum of Natural Science since 1995 and its chairman. She was on the trustee boards for the Manned Space FLIGHT Education Foundation, River Oaks Baptist School and the Houston A+ Challenge.
She inherited $3.1 billion upon the death of her Father. Due to a temporary repeal in the estate tax law for the year 2010, Duncan became the first American Billionaire to pay no estate tax since its enactment.
In 2013, Williams was elected as Enterprise Production Partners' non-executive chairman.