CEO cites "personal reasons." Move comes after an investor exposed one discrepancy in his resume.
Company stresses video and rich media ad offerings amid disappointing U.S. ad growth.
Original ClickZ analysis: GOP spent less than half on digital ads through March.
Ad tag management firm's clients include the Gap and the Obama campaign.
Marketers praise Google's new tools, but question whether they will be effective enough.
Display advertising fell for a second consecutive quarter; search revenue up by 3 percent.
Paul Gunning says firms like Zynga and EA are missing big opportunities.
Its agency of record, Mile 9, talks about targeting hardcore runners online.
Tech giant's Q1 earnings call reveals $10 billion in ad sales, as CPC falls again.
Examines ad viewability rates from 12 major brands, across nearly 2 billion impressions.
Ad buyers and sellers invest more in counting only ads that are within eyeshot of consumers.
AdWords changes aim to simplify bidding and optimizing display campaigns.
Rising competition among ad sellers and sluggish economy puts a damper on earlier forecast.
AdLearn Open Platform will compete with Turn, MediaMath, DataXu, and Google's Invite Media.