Joy Buolamwini knew there was a problem with the AI when she had to don a white mask to be recognized by it as a researcher at the M.I.T. Media Lab. Today, she is fighting for equality in the code that powers everything from job applications to law enforcement. She founded the Algorithmic Justice League, authored a study that led tech giants to improve their AIs, and made a documentary – Coded Bias – that’s available on Netflix. This year, her study exposing bias in Amazon’s facial-scanning technology stirred the retailer to push back against the use of this technology.