Where: Nielsen Online, New York
Why: Itzhak leads Nielsen Online, a division of Nielsen Co. formed in June when Nielsen completed its acquisition of NetRatings. Nielsen Online includes the Nielsen//NetRatings Internet audience measurement service and Nielsen BuzzMetrics, which tracks user-generated media. Itzhak was previously chairman of Trendum, a search and analytics company that acquired BuzzMetrics in 2005. He served as chairman of Nielsen BuzzMetrics prior to his current position.