George Kaiser

Lifetime donations: $3.3 billion
Net worth: $9.3 billion
Generosity Index: 35%
George Kaiser, chairman of BOK Financial Corporation, also founded the George Kaiser Family Foundation, which gives to educational, health, religious, social, and community-development-related causes, including the Tulsa Community College Foundation, Oklahoma City Educare, National Energy Policy Institute, the Tulsa Community Foundation and the University of Tulsa.
In 2010, Kaiser joined the Giving Pledge, vowing to donate half of his fortune to charity.
Source: Wealth-X