Derek Willis writes about congressional behavior, campaign finance and other topics for The Upshot, a Times politics and policy site. From 2007-13, he was a member of The Times’s Interactive News desk, where he built and maintained political databases used in web applications on nytimes.com and in Times articles. Previously, he worked at The Washington Post, the Center for Public Integrity, Congressional Quarterly and The Palm Beach Post, specializing in using data to find and tell stories. He lives in Silver Spring, Maryland, with his wife and daughter, and lives online at thescoop.org.