Who is Tom Steyer? Current job: Billionaire environmental activist and political megadonor. Age: 62See the rest of the story at Business InsiderNOW WATCH: Extremists turned a frog meme into a hate symbol, but Hong Kong protesters revived it as an emblem of hopeSee Also:Democratic primary voters think only three candidates could beat TrumpBernie Sanders says he doesn't intend to release a funding plan for Medicare for All any time soonChrissy Teigen and John Legend reveal that Elizabeth Warren is their favorite 2020 candidateSEE ALSO: Here's everyone who has officially announced they are running for president in 2020