Ruth P. Stevens teaches marketing at Columbia Business School and is a guest blogger at HBR.org and Biznology. She is also the author of Maximizing Lead Generation: The Complete Guide for B2B Marketers (Que, 2011). Currently serving as a director of Edmund Optics, Inc., Ruth has held senior marketing positions at Time Warner, Ziff-Davis, and IBM. She was named one of the 100 Most Influential People in Business Marketing by BtoB magazine.