Michael Bloomberg vs. Alice Walton

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.

After graduating from Trinity College in 1971, Walton briefly worked for Walmart as a buyer of children's clothes. Her art collecting career began when she was 11 and bought a 25-cent print of Picasso's "Blue Nude".