Technology blog *All Things D" reports that Andy Miller, VP of Apple's iAd mobile advertising division, is leaving to join venture capital firm, Highland Capital.
Miller came to Apple as part of the Quatro Wireless acquisition, which Apple purchased after losing out on AdMob to Google. He reported directly to Steve Jobs. iAd, however, has faced a number of issues and hasn't exactly set the mobile ad world on fire.
No word yet on who will replace him.