Davis follows a long line of departures from the mobile group. In Feb., Marco Boerries, the EVP for Connected Devices. left the company after heading its mobile efforts for years. Before that, Boerries had restructured the whole unit, including naming David Ko as SVP of Mobile, who replaced out-going Steve Boom. Meanwhile, LocalMobileSearch reports that Michael Bayle at MobileBeat, formerly Yahoo’s senior director of global mobile advertising, has also resigned.

Davis joined Yahoo in 2005, and most recently had the title of chief scientist of Yahoo! Mobile and VP of early stage products. In his own words, he said: “his work focuses on creating the technology and applications that will enable the billions of daily media consumers to become daily media producers. His research encompasses the theory, design, and development of sociotechnical systems that leverage contextual metadata and the power of community to enable people around the world to produce, describe, share, and remix media, and to connect to each other in new ways.”

Prior to Yahoo, he was assistant professor at UC Berkeley School of Information for four years.