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The departure of David Rosenblatt, the former chief executive of display-ad technology group DoubleClick, is a setback to Google, which has said that making inroads into the display advertising market is a top strategic priority.
Mr. Rosenblatt is leaving because he would like to run a company, say people familiar with the matter, who add that he has yet to formalize specific plans. His departure was reported earlier by The New York Times.
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"It's important to remember that we have a strong executive leadership bench in place to support all our businesses, and have tapped into that bench," the company said in a statement.
Mr. Rosenblatt's departure follows that of Tim Armstrong, the company's top Americas sales executive, who left to lead Time Warner Inc.'s AOL unit. Sukhinder Singh Cassidy, head of Google's Asian operations, also left after she was passed over to succeed Mr. Armstrong. Earlier this month, Google said sales chief Omid Kordestani was moving into a new role, as senior adviser to the office of the CEO and founders.