Mike Costello joined Goodby Silverstein & Partners as an associate creative director.  Costello joins the agency, following a four-year stint as an associate creative director at Leo Burnett Chicago. While there, Costello worked on Allstate's "DIY Mayhem" social campaign, Firestone's "Pick Up" campaign and the "Van Gogh BnB" effort for the Art Institute of Chicago. The "Van Gogh BnB" campaign led to the museum's highest attendance in 15 years. Prior to Leo Burnett, Costello spent seven years at Arnold Boston as an art director and an associate creative director, working on ESPN, Carnival Cruise Lines, Celebrity Cruises, Volvo, McDonald's and …

Havas New York named Diana Vienne as chief talent officer. She will partner with Laura Maness, president of Havas New York, and the leadership team to shape the Talent Acquisition and Talent Management functions of the office. Vienne joins Havas from MMC (Marina Maher Communications), an Omnicom agency, where she aided the company through a digital transformation and organizational change of management that affected all aspects of the business. Prior to MMC, Vienne spent more than 17 years as a global business consultant, working with consulting firms, such as Deloitte Consulting, PwC and Ketchum Change to deliver strategic change and …

MDC Partners hired Randy Duax as senior vice president of talent and recruiting, a new position at the company. Daux will be based in New York and report to Scott Kauffman, chairman and CEO of MDC Partners. Duax joins MDC Partners from WPP, where he most recently served as talent director of Asia Pacific and was responsible for senior executive recruitment across WPP's company holdings and teams in Singapore, Shanghai, Sydney and Tokyo. Prior to moving overseas, he worked for WPP in New York and oversaw senior executive recruitment across WPP's firms in North America. "No industry is more dependent …

Mono added Katie Mack as new business director, Minneapolis and Chris Ryan as copywriter, San Francisco.

Ascedia added Chris Remington as director of client strategy.

Catapult tapped Peter Unger as vice president, creative director.

Ruffian added LA-based director Basak Erol to its roster.

Kargo named Samantha Zurek as regional vice president, Midwest.

GE Appliances named Rick Hasselbeck as chief marketing officer.

Bidtellect named Kimberly Bambach as chief financial officer.