Dan Duncan (born 1933) is cofounder, chairman and majority shareholder of Enterprise Products. According to Forbes magazine, as of 2007 Dan Duncan is the richest person in the city of Houston and the 3rd richest person in Texas, with a net worth of 8.2 billion dollars (according to page 46 in the October 27, 2008 issue of Forbes, Duncans net worth dropped from 7.6 billion on Aug 29th to 6.3 billion on Oct 1st) .
Duncan recently donated a sculpture by Jean Dubuffet named "Monument au Fantóme". It was originally in front of 1100 Louisiana in Downtown Houston.He has donated 75 million dollars to Texas Children's Hospital and the Houston Museum of Natural Science, as well as $135 million dollars to Baylor College of Medicine. 
Duncan owns the Double D Ranch, a 5,000-acre (20 km2) fenced hunting facility in Texas. Duncan is a Safari Club International member who has been given numerous awards for his hunting trophies. In 2006, he received the SCI World Conservation Hunting Award, which requires a hunter to have hunted on six continents, and have received SCI's 13 "Grand Slam" awards, 22 "Inner Circle" awards, the Fourth Pinnacle of Achievement Award and the Crowning Achievement Award.
Duncan has 407 entries in SCI's trophy record book, including records for killing lions, elephants, jaguars, a cheetah, rhinoceroses, polar bears, and other animals.
On July 18, 2007 Dan Duncan voluntarily appeared before a grand jury in Houston. He answered questions regarding a hunt in Russia in 2002 in which he shot and killed a moose and a wild sheep from a helicopter, which is illegal under Russian law. He admits to his actions, but says he did not know his actions were illegal. His attorney said on September 12, 2007 that a grand jury have declined to bring charges against Duncan and other hunters on the trip.