Jack Gillum is an Associated Press reporter for the Washington, D.C. investigations desk covering privacy, technology, and surveillance. He relies on databases and programming to sift through the massive world of information. He broke the story that Hillary Clinton used a private email server at her home and he mined information on Instagram to track Illinois Rep. Aaron Schock's spending. While at USA Today, he pursued data-driven investigations into standardized test cheating. He has also reported for the Arizona Daily Star in Tucson, his hometown.