BRUCECAMPBELL was named president, digital media, emerging networks and business development for Discovery Communications. Campbell will oversee worldwide business development activities for Discovery Communications including acquisitions, joint ventures and all major business transactions. Campbell is currently executive vice president of business development, NBC Universal.

DANNY SEARLE was named chairman and chief creative officer of BBDO in Singapore. Searle is currently creative director at Clemenger BBDO Sydney.

Hill and Knowlton USA hired CLAUDINE MOORE as US director, business development and marketing. Moore joins H&K from G2 where she was responsible for the corporate communications for G2 Branding and Design and G2 Promotional Marketing.

Medio Systems named GARY BEMBRIDGE, the former National Sales Director of MSN Sales, to the newly created position of head of US advertising sales. Bembridge will lead and grow an advertising sales team for Medio’s newly launched MobileNow Ad Network.

MIKE BILLINGSLEY joined Return Path’s Authentic Response division as the vice president of sales. Billingsley most recently worked for Global Market Insite as managing director of sales and managing director of panels.

Scripps Networks hired DEANNA BROWN as president of its Interactive Group. Most recently, Brown served as the general manager of Yahoo! Media Group’s Lifestyles business unit.

International Data Group promoted COLIN CRAWFORD to president & CEO of PC World Communications and Mac Publishing.

Tribune Publishing named TIMOTHY (TIM) RYAN as president, publisher and chief executive officer of The Baltimore Sun Company, succeeding RONDRA MATTHEWS, who is stepping down for personal reasons.

Zillow.com named GREG SCHWARTZ as vice president of sales. Schwartz, who previously led ad sales at CNNMoney.com, will be responsible for heading Zillow’s national advertising sales team.

Ad Infuse named BRENT WALL as sales manager.