Net Worth: $4 billion
Source: Inheritance, hedge funds
The youngest son of the late William Ziff Jr. who built the Ziff-Davis publishing empire (PC Magazine, Car & Driver, Boating) and later sold out. Daniel and his brothers Dirk and Robert inherited their father's fortune, which they have since reinvested in Ziff Brothers Investments. He recently got married.
(Victoria Will/Splash News/Newscom)