Marcus Startzel is moving from the adtech to ecommerce: He’s becoming the new CEO at Whitebox. One of his first tasks, apparently, will be raising a Series A. Startzel was previously an executive at AppNexus, which he joined after the acquisition of MediaGlu, where he was CEO. (He departed AppNexus after it was bought by AT&T.) He’s also had senior roles at Millennial Media and Advertising.com. Whitebox, meanwhile, was founded in 2013 by previous CEO Rob Wray.