Daniel Harrison, III. was born in United States. Royal Dutch Shell is selling its oil wells on the 100,000-acre ranch it leased from Dan Harrison III in 2010. Harrison received $1 billion in cash from Shell plus royalties on future oil and gas production from the prolific Eagle Ford shale. The deal appears to be the biggest ever for a family with deep roots in Texas oil. His grandfather, the first Dan Harrison, was a legendary Texas oilman, teaming up with J.S. Abercrombie to discover gushers like the Old Ocean field in Brazoria County. He built up and oil and ranching empire across Texas. Father Dan Jr. ran the ranchland and was a master breeder of quarterhorses. To this day Dan III maintains a quarterhorse operation on a ranch in Fulshear. For a time, Dan III shared the empire with brother Bruce (d. 2004), and back in 1990 they sold a 43,000-acre west Texas ranch for about $70 million.