David Koch is he is part-owner of Koch Industries, along with his brother, Charles.
Koch Industries owns Georgia-Pacific, Invista, and Flint Hill Resources, but its core industries are the manufacturing, refining and distribution of petroleum, chemicals, energy, fiber, intermediates and polymers, minerals, fertilizers, pulp and paper, chemical technology equipment, ranching, finance, commodities trading, as well as other ventures and investments.
No wonder the DUmmies hate him. He's an OIL MAN!

And he's one of the EVIL RICH!
