Dan Rosensweig, CEO of Activision Blizzard's Guitar Hero division has left the company to take the chief executive role at a textbook rental startup firm.

Rosensweig assumed the role in March of last year. Since then, music game sales have fallen significantly from their 2008 peak despite the release of several new titles, including Guitar Hero 5, Band Hero, and DJ Hero.

Rosensweig previously worked at Yahoo and CNET Networks, and had a stint in the venture capital world.

David Haddad, the Guitar Hero unit's COO, is taking Rosensweig's responsibilities. He will report to Mike Griffith, president and CEO of Activision Publishing, who will oversee the division.

Here's Activision's release:
Activision Publishing, Inc. (Nasdaq: ATVI) announced today that David Haddad, Chief Operating Officer of Guitar Hero, will assume operational responsibilities for the business unit following the departure of President and CEO, Dan Rosensweig, who has left the company to pursue other career opportunities. Mr. Haddad will report to Mike Griffith, President and CEO of Activision Publishing, who will continue to oversee the Guitar Hero business unit.

"We would like to thank Dan for his contributions to the Guitar Hero business," stated Mike Griffith. "We widened our leadership in the music gaming genre in 2009. And now, as we enter 2010, David Haddad, with his broad consumer product and digital/online experience, is the right leader to drive our agenda to improve profitability."

Mr. Haddad brings more than 25 years of experience to Guitar Hero from such industries as online, traditional entertainment and consumer products. Prior to joining Activision Publishing, Mr. Haddad served as Chief Operating Officer of Vivendi Games' Sierra Online division, where he oversaw global product marketing, sales, live production, and business development initiatives for online games and console downloadable titles.

Before joining Sierra Online, Mr. Haddad served as a division president for Mattel, Inc. and held executive management positions at such entertainment companies as the Walt Disney Company, and Liveplanet, Inc.

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