• by Joe Mandese  @mp_joemandese, May 10, 2011

Celtra, a promising self-service platform for creating and serving rich media ads, and analyzing their performance across mobile devices, this morning announced several key appointments to its management team, and the naming of former Aegis Media North American chief Sarah Fay to its board.

Celtra, which is based in Cambridge, MA, named David George COO, and said it has opened offices in New York City and Los Angeles to help cultivate interest on Madison Avenue.

Grant Stratemeyer was also named vice president of business development.

George, joins Celtra with 20 years of successful experience building sales, marketing, business development, services and business building operations globally for digital media based companies such as KickApps, Maven Networks, and eBay.

Stratemeyer joins from Yahoo, where he was responsible for its agency channel and previously was while at Maven Networks, where he built and managed the agency and partner business.