42. Susan Wojcicki
$480 Million Age: 50 Residence: los altos, california
In December, YouTube’s CEO promised a heightened commitment to monitoring disturbing content on the video site. YouTube, which she encouraged Google to buy in 2006 and has run since 2014, now has 1.9 billion monthly users. She grew up on Stanford’s campus, where her father worked as a physics professor. Her mother, a journalism teacher, set up the media program at Palo Alto High School. Her youngest sister, Anne, is founder of 23andMe (No. 44); sister Janet is a professor at UC San Francisco.