Paul H. Koch

David Hamilton Koch ( KOHK; May 3, 1940 – August 23, 2019) was an American businessman, political activist, philanthropist, and chemical engineer. In 1970, he joined the family business: Koch Industries, the second-largest privately held company in the United States. He became president of the subsidiary Koch Engineering in 1979 and became a co-owner of Koch Industries (along with elder brother Charles) in 1983. Koch served as an executive vice president of Koch Industries until he retired due t…