Michael Bloomberg

Lifetime donations: $3 billion
Net worth: $37.7 billion
Generosity Index: 8%
Michael Bloomberg is the founder and CEO of Bloomberg media company and founder of the Bloomberg Foundation, which gives primarily to educational, healthcare, and environmental causes. Recipients of the foundation's donations include John Hopkins University, World Lung Foundation, World Health Organization, Sierra Club Foundation, and John Hopkins Bloomberg School of Public Health.
Most recently, Bloomberg launched a $42 million "What Works Cities" initiative aimed at helping 100 mid-sized cities to make better use of data and evidence through his philanthropic arm, Bloomberg Philanthropies.
Source: Wealth-X