Nathanson made much of his fortune in the $3.7 billion sale of his Falcon Communications in 1999 to Charter Communications, then closely held by Microsoft Corp. co-founder Paul Allen. He founded Mapleton Investments, which manages a range of global ventures valued at more than $1 billion including equities, fixed income, private equity, real estate, art and direct investments. Mapleton’s real estate arm, Mapleton Properties, has more than $400 million in assets across several sectors including multifamily, office and industrial properties in four states.
Recent real estate deals include properties in Portland, Ore. and Glendale. Mapleton has been a longtime investor in waterless urinal maker Falcon Waterfree Technologies. Nathanson and wife Jane donated $50 million in art to the Los Angeles County Museum of Art in 2015, and commissioned a Jeff Koons sculpture. He serves as co-chair of the Pacific Council on International Policy, vice chair of the National Democratic Institute and a trustee of the Aspen Institute.
Last year: $1.6 billion
RESIDENCE: Westlake Village
SOURCE OF WEALTH: Entertainment