Steve Mykolyn was appointed chief creative officer of TAXI Europe. Mykolyn is currently chief creative officer of TAXI North America.

Saatchi & Saatchi X hired Thierry Dumoulin as executive vice president, managing director of the New York office and Janet Rose as vice president, planning director of the Fayetteville office.

Q Interactive named Dale Baker as its chief executive officer.

Wieden+Kennedy hired Iain Tait as global interactive executive creative director effective April 1. Tait spent the past eight years as creative director and head of strategy for Poke in London, where he was a founding partner, working on clients such as American Express, Orange, Topshop, Yahoo and Zopa.

TBWA Worldwide announced that Neal Grossman would add the role of chief compensation officer to his current responsibilities as chief operating officer of TBWA/Chiat/Day's Los Angeles office.

Mediaedge:cia hired Star Kalatzan as managing director, responsible for IKEA, Novartis, YUM! and Toys'R'Us. Kalatzan joins MEC from Universal McCann, where she was senior vice president, managing director.

AudienceScience hired Denise Colella as chief revenue officer.

Tremor Media hired Angelo D'Agostino as vice president, human resources, in its New York City headquarters, replacing Kyle Carter who left the company.

Initiative hired Raquel Krouse to head up the network's social media solutions division Prophesee as senior vice president, director. Krouse joined Initiative from IPG Emerging Media Lab, where she was vice president, practice lead, social media.

Ira Helf has joined JWT North America as director of analytics for North America. Helf joins the agency from Draftfcb New York, where he served as executive director, data and analytics.