 Between 1993 and 1995, Jeffery was a staff editor and writer at "Washington City Paper".She was a senior editor at "Harper's Magazine" (1995–2002), where she edited six articles nominated for a National Magazine Award, including essays by Barbara Ehrenreich that became "Nickel and Dimed".She became deputy editor of "Mother Jones", a position she held for four years, and was promoted to co-editor in August 2006.