Michael Bloomberg vs. Larry Page

In 2018, Bloomberg pledged $1.8 billion to Johns Hopkins University, his undergraduate alma mater, adding $1.5 billion he had already given the school. As a teenager, Bloomberg worked at an electronics company in Cambridge, Massachusetts.

Page has avoided public appearances since Sundar Pichai became Google's CEO, including Alphabet's 2019 shareholders meeting -- much to investors' chagrin. Page is a clean energy advocate; his Palo Alto home uses fuel cells and geothermal energy.