Word-of-mouth marketing agency Ammo Marketing has hired GARY STEIN as director of strategy. He briefly served as director of client services for BuzzMetrics. Prior to that he was a senior analyst for Jupiter Research, where he covered advertising, marketing, and the consumer packaged goods industry.

GREGG LIEBMAN (pictured) has been promoted to senior vice president of CNN Ad Sales Research. Liebman, who joined the company in 2004, is responsible for leading staff research analysis and strategy support for the CNN News Group ad sales division. In addition, KEITH BERKELHAMER has been promoted to vice president of CNN Ad Sales digital research.

aQuantive has named WAYNE WISEHART chief financial officer, replacing MICHAEL VERNON. Wisehart most recently served as chief financial officer of Western Wireless.

MATTHEW DAY, who left the managing director post of Beyond Interactive’s Ann Arbor office last summer, has launched SILVERFOX, an ad agency based in San Francisco.

Tangomagazine has tapped HILARY BLACK as its editor in chief. Black joins Tango from More magazine, where she was a founding editor and served as entertainment director.

CILLA SNOWBALL, currently chairman of AMV BBDO and Proximity London, will retain her current roles and be promoted to chairman and chief executive of AMV Group. She replaces MICHAEL BAULK, who is retiring in July.

TONI EGGER has been named vice president, development for The Science Channel and Military Channel. Previously, Egger was vice president, development for Discovery Health Channel.

Cultivator Advertising & Design has named SARA PAYNE as senior account manager on the Red Robin Gourmet Burgers, Keystone Resort, New Belgium Brewing and Oxford Spa accounts. Payne was previously account executive at Thomas Taber & Drazen, Denver.

NILS VON ZELOWITZ has joined Rapp Collins, New York, as vice president of digital marketing. He was most recently account director, vice president at Wunderman, New York.

MPG has named DERVILLA KELLY senior vice president, director of communications strategy, overseeing the Hershey Chocolate brand business at MPG and leading channel neutral planning with creative sibling shop Arnold. Prior to joining MPG, Dervilla was strategic planning director at MindShare, overseeing American Express Proprietary Card Business.