Brian Wallace, the Vice President of digital marketing and media at Research In Motion, has reportedly left the BlackBerry maker for Samsung — the top cell phone company in the U.S. According to Advertising Age, Wallace will pick up at Samsung as Vice President of strategic marketing for the U.S. Instead of focusing on digital media, Wallace will also work on branding and offline media. Research In Motion announced its first-quarter earnings yesterday and missed analyst estimates for the quarter. The firm shipped 500,000 units of its new BlackBerry PlayBook tablet, but also said that it would have to reduce its workforce.