TOM DEMPSEY was named director of digital investment for GroupM North America, a new position. Dempsey joins GroupM from his previous role as managing partner, director of national broadcast at Mediaedge:cia.

DAVID VERKLIN will step down as CEO of Aegis Media at the end of the year and SARAH FAY has been named to replace him.

ORLENA YEUNG has been named vice president of marketing for Last.fm. Yeung, formerly the global brand manager at Microsoft Xbox, will oversee all aspects of Last.fm's marketing strategy.

Perfect Fools appointed MARK CHALMERS as a new partner and creative director. Chalmers was formerly executive creative director at StrawberryFrog Amsterdam working on global campaigns for clients including Heineken, Mitsubishi, Coca-Cola and ASICS Onitsuka Tiger.

St. John & Partners promoted GREG MADALENO to management supervisor on the firm's Ford business.

Wunderman New York hired CAMERON KELLOCK and JOANNA PEÑA-BICKLEY as executive creative directors. Most recently, Kellock was at partisan, handling creative chores on Tishman Speyer Properties. Peña-Bickley joins the agency from TraceyLocke where she served as vice president, interactive, working on Pepsi, Hershey's, Nestlé's and Kimberly-Clark.

DAYNA MCCAMLEY was named client director at The Brand Union.

a52 hired RON COSENTINO as executive producer.

Experian Research Services hired JIM TOBOLSKI as senior vice president, sales agency group. Prior to joining ERS, he served as vice president of sales for Arbitron's Advertiser Agency Services Division.

Alloy Media + Marketing hired CHRISTINE PETRILLO as vice president, business development director.