Mansfield teaches in Medill's Washington program. He was previously Executive Editor, Digital at National Geographic. At Nat Geo, he oversaw editorial content across the Web, mobile, and magazine app. He was responsible for the editorial experience on all digital platforms, shaping content initiatives and supervising Nat Geo’s digital storytelling, web design, application design, and short-form video teams, as well as producers creating online content for the the National Geographic Society’s Mission Programs division. Prior to National Geographic, Mansfield was an associate professor at Northwestern University’s Medill School, where he was director and bureau chief for the school’s reporting program in Washington, D.C.