JWT named Michael Byrne as chief financial officer of its New York office. Most recently, he served as chief financial officer of McCann Erickson New York.

Arnold Worldwide announced that Elizabeth Coveney will be joining the agency as managing partner and executive director to lead the McDonald’s business. She comes to Arnold from Coca-Cola North America where she was vice president of national accounts in the Foodservice Division.

Jumptap hired Matt Mulderink as director of retail.

TRIS3CT announced that Javier Osorio joined the agency as creative director on the Kimberly-Clark business.

Sub Rosa hired Ian Dapot as creative strategy lead. Dapot was previously communication design lead at IDEO, Boston & NY.

Dieste co-founder Tony Dieste has returned to the agency as chairman.

Suresh Khanna joined AdRoll as vice president of sales, having recently served as Google’s director of new advertiser sales.

Maxus expanded its global trading team by appointing Simon Porter as Asia Pacific head of trading.

LiveRail hired Marc Gaccione as executive director of publisher services; Ward Flock as senior director, publisher development; and Christine Pereira as senior director of demand services.

Austin based independent agency, Proof Advertising has added Scott Staab as digital creative director and Rob Story as associate creative director.

DISH Media Sales promoted Adam Gaynor to director, advertising sales.

CP+B promoted Neil Riddell to vice president, executive director of product innovation.

Protagonist NY hired Larson Banilower as client services director.

Gyro tapped Steffan Postaer as executive creative director for its San Francisco office. Postaer was most recently chairman and chief creative officer of Euro RSCG Chicago.

Tremor Video promoted Abbey Thomas to vice president of national entertainment sales.

Twelvefold Media named Jenny Brodowsky as vice president of sales, east.

The Martin Agency promoted Joe Alexander to executive creative director.

GlobalHue promoted Maria Lopez-Knowles to president of GH Latino, Vida Cornelious to chief creative officer, and Michael Jacobs to chief digital officer.

Miles Dennison was named chief revenue officer at BLiNQ Media.

Martha Stewart Living Omnimedia promoted Gael Towey to chief integration and creative director and Kerry Tucker as senior vice president of partner marketing.

Rey Interactive hired Dogan Dattilo as vice president, clients & innovation and Danielle Kugell as director, client services, east.

Brokaw hired Troy Walker to lead the agency’s new retail marketing arm.