His estimated net worth is $17.5 billion, stemming from the success of Koch Industries, a privately owned energy conglomerate whose subsidiaries include Georgia Pacific, the maker of Brawny paper towels, and Invista, the maker of Stainmaster carpet and Lycra fiber. As of September, Koch had succeeded Michael Bloomberg as the richest man in New York City, …

Broad made his fortune with his real estate company, Kaufman & Broad, and then found financial company SunAmerica where he served as CEO. He is actively involved in revitalizing L.A.’s downtown area and is an avid supporter of enriching the city’s cultural life. The Broads created a family foundation in the 1960s as a way …