David H. Koch was an American businessman and philanthropist, known for his role as a co-owner of Koch Industries, one of the largest privately held companies in the United States. Born on May 3, 1940, he was the youngest of four brothers in the Koch family, which has a significant influence in various industries, including energy, chemicals, and manufacturing. In addition to his business endeavors, Koch was a prominent supporter of various cultural and educational institutions. He contributed to organizations such as the American Museum of Natural History and the Lincoln Center for the Performing Arts. David H. Koch passed away on August 23, 2019, leaving a legacy in both business and philanthropy.