Investigative Journalist Maddy Varner extracts datasets from public documents and databases to help build a more concrete understanding of how organizations use technology to predict and affect behavior—and the problems in those assumptions. Before The Markup, she was a researcher at ProPublica, where she was on a team that won a Loeb Award for Beat Reporting in 2017 for “Monetizing Hate,” a series of stories that examined Facebook’s ad practices.