Michael Rubenstein is the latest high profile Google (NSDQ: GOOG) exec to depart the company to pursue other interests, MediaMemo’s Peter Kafka reported. Rubenstein was a VP and director of Google’s Ad Exchange, which is part of the DoubleClick unit and serves as a platform for display ad sales. Rubenstein arrived at Google with the acquisition of DoubleClick for $3.1 billion two years ago. While this exit follows a growing line of Googlers out the door over the past few months, Rubenstein’s decision to leave now comes as Google is still trying to follow through on its promise to do for display ad sales what it did for search ads. That effort suffered its first blow back in April, when former Doubleclick CEO David Rosenblatt stepped down. Rubenstein joined DoubleClick in 2001 when the company he worked for, e-mail marketer FloNetwork, was acquired. Google has not named a replacement for Rubenstein, but Kafka reported that the it is looking to make an outside hire. There was also no word on what sort of “opportunities” Rubenstein is pursuing.

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