Sergey Brin vs. Michael Bloomberg

The richest immigrant in America, Brin has been an outspoken critic of Trump's immigration ban. Brin moved to the U.S. from Russia when he was 6 years old in the wake of anti-Semitism against his family.

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.