Donald Bren Net Worth $17.2 billion
Founder of the Bren Company, Donald Bren began building California homes in 1958.
By the 1960s, he had developed the city of Mission Viejo in California and went on to eventually purchase the 146-year-old Irvine Company.
It is thought that Bren may be the wealthiest real estate developer in the US.
Net Worth: $17.2 billion
Industry: Real Estate