GumGum, the developer of in-image advertising technology headed by Ophir Tanz, is bolstering its sales efforts, and has hired an Amazon veteran to head up western sales. According to GumGum, Matt Weisbecker has been appointed Vice President, Western Sales for GumGum, a new position for the company. Weisbecker was previously Director National Sales & Strategy for Amazon Media Group, working on the entertainment vertical for such properties as Amazon Mobile, IMDb, IMDb Mobile and Kindle/Kindle Fire. He also has served at NBCUniversal and AOL. GumGum is backed by NEA, GRP Partners, First Round Capital and Crosscut Ventures, and develops in-image advertising technology focused on interactive ad units integrated with photos on the sites of web publishers.