"Audra is an exceptional creative leader who has the ability to inspire. Her strategic approach, idea-driven creative and mixed-media expertise make her a seamless fit for our clients and for us," said CEO Abigail Honor.

Malm Hallqvist began her career in the agency business as co-founder of Propaganda, which she sold to McCann in 2000. She remained at the agency for 15 years, becoming executive vice president, global chief growth officer in 2011.

"MDC Partners is a force to be reckoned with in Europe, and while the MDC agencies and their work are celebrated globally, this market has yet to see the full strength of the network or appreciate its stark contrast to the legacy models of its peers," said Malm Hallqvist.

In this newly created role, he will apply his creative skills across all the agency's clients, including Kronans Apotek. He will report to creative director, Klas Lusth and be based in Stockholm.

Jonsson joins from Honesty Stockholm, where he worked since 2011 on campaigns including INGO, Riksgälden, Scandic Hotels and H&M.

Prior to Honesty, Jonsson worked at agencies such as Ester Stockholm, John Doe Worldwide Stockholm, Goss Gothenburg and ANR BBDO.

Jonsson's appointment follows the recent additions of copywriter Magnus Ivansson and strategy director Rasmus Bjurström. This new team is in response to a number of new business wins, says the agency.

"I believe that the digital arena is the most exciting and promising place to be right now, and Perfect Fools stands out as a digital pioneer," says Jonsson.

"Throughout Ariana's U.S. and international agency career, she has developed smart brand strategies focused on understanding consumer behavior as it relates to the fast-evolving world of digital technology," said Bill Kolb, president, diversified agencies, McCann Worldgroup. "In her expanded role, she will help MRM//McCann continue to integrate brand insights with data and technology in ways that help our clients generate innovative and business-building customer-relationship solutions."

Added McCann Worldgroup global chief strategy officer, Suzanne Powers: "Ariana's got it all: From her experience in social sciences and all things digital to her strong strategic acumen and intuitive understanding of brands and people; she's the perfect blend."

George joined Zambezi from Saatchi & Saatchi Los Angeles where he was a writer on Toyota, and prior to that worked at CP+B Boulder on Burger King, Sprite and Volkswagen. Rodgers previously worked at Daily & Associates in L.A. and before that Goodby Silverstein and Partners in San Francisco, where he worked on Logitech, Sprint, Dickies, Sonic and Cheetos.

"Ben and Nick are prolific creative thinkers who bring the same passion and commitment to every project they touch," said Josh DiMarcantonio, executive creative director at Zambezi. "They are a huge part of our Zambezi family and we are excited to see them grow and excel as creative leaders."