David guides SEM and SEO strategy across all Yahoo properties, overseeing programs, managing infrastructure teams, and establishing internal best practices and campaign management standards. He has 10 years of SEM experience, recently working with Carat Fusion, a full-service advertising agency, as the director of SEM in the San Francisco office. Previously, Roth worked with Avenue A|Razorfish, eonMedia, and Inceptor. He holds an MBA from UC San Diego and a B.A. in sociology from UC Berkeley.