5. Hansjoerg Wyss
Net Worth: $6.1 billion
Source of Wealth: Medical Device
Hansjoerg Wyss is among the most philanthropic people in the world, with charitable foundations that have assets of nearly $2 billion. In 2013, he pledged $125 million to Harvard University to establish a biological institute to research how nature builds, controls and makes things. Wyss also donated $4.25 million in 2013 to The Trust for Public Land, to purchase oil and gas leases on 58,000 acres of land in Wyoming’s Hoback Basin to protect it from development.
4. Willi & Isolde Liebherr
Net Worth: $6.1 billion
Source of Wealth: Construction
Willi and Isolde Liebherr’s father, Hans, was one of the most revered industrialists of post-World War II Germany. When Hans died in 1993, at the age of 78, management control passed to Willi – a mechanical engineer, and his sister, Isolde, who joined the business in 1976 after earning a degree in management.