The Africa Channel has named MARCO WILLIAMS vice president of affiliate marketing.

CLINT STINCHCOMB has been promoted to executive vice president and general manager for HDTV and New Media at Discovery. In his new role, Stinchcomb will oversee all programming, production, development and operations for Discovery HD Theater and TURBO, Discovery’s new multi-platform brand in the U.S.

CATHRYN CRONIN CRANSTON has been named executive vice president of strategy and sales development at Mansueto Ventures. Cranston joins the company from Harvard Business Review, where she served as publisher.

STEVE SULLIVAN, senior vice president, communications for Liberty Mutual Group, was elected chairman of the Association of National Advertisers, succeeding JIM STENGEL, global marketing officer, Procter & Gamble.

MARGARET LEWIS was named evp, US head of communications planning at Universal McCann. Lewis joined the agency from Mediaedge:cia.

ROBERT MORRIS joined Young & Rubicam Brands Irvine in the newly created position of vp, director of digital. In this role, Morris will direct the agency's full service digital practice on behalf of all client partners.

DANIELLE PERISSI has joined Time Inc.’s Corporate Communications Department as executive director.

MARY MURCKO has been named vice president and publisher of Women's Health.

Tribune Publishing has named DAVID D. HILLER president, publisher and chief executive officer of the Los Angeles Times, succeeding JEFF JOHNSON, who resigned.

MARC WALKER joined Reuters as Midwest account director from Knight Ridder Digital’s Real Cities Network. ALISON RAYFIELD was tapped as account executive and joins the company from Advertising.com. Lastly, SUMITA SINGH joined the media division as VP, global head of marketing insights and provides research support for all of Reuters’ digital initiatives.