Chiavone joins the agency from DM9DDB in Brazil, where she most recently served as senior vice president and head of strategy. Prior to that, she founded Limo Inc., a research and trendspotting boutique, working for Heineken, Nike and Mondelez, to name a few. Chiavone also held leadership roles at Y&R and AlmapBBDO.

"Anyone would – rightfully – be impressed by Laura's body of work and her contributions to DM9DDB. She is a rare strategic talent," said Guest. "Her unique abilities to build collaborative and multidisciplinary teams while cultivating senior-level client relationships, make her a perfect fit for this important role at Tribal New York. Laura is an important addition to that office's leadership team."

Tribal Worldwide New York Office was recently named agency of record for ERA Real Estate, and tapped by Boys & Girls Clubs of America to develop a social media strategy for the non-profit.

Lester joins the agency following freelance work at 72andSunny. Lester recently worked with Zambezi on a freelance basis on its "Come As You Are" campaign for Las Vegas Sands Corp's Venetian Resort. He previously served as executive vice president, executive creative director at Deutsch LA, where he led creative for Sprint.

Throughout a 20-year career, Lester has worked in London, New York, San Francisco and Los Angeles, for agencies 180LA, Goodby, Silverstein & Partners and BBH London and NYC. He created national and global work for Levis, Lexus, Sony, Netflix and Google, among others.

"Zambezi's mission is to be one of the most admired independent agencies in the world," said Chris Raih, founder of Zambezi. "A new partner like Gavin signals our commitment to the creative work. Plus a commitment, not just to growth, but the right kind of growth. He will lead us from Day One."

Most recently creative director, Hornaday led creative for Hershey, Anheuser-Busch, Cargill, Noodles & Company and Vanity Fair. Before Barkley, she was a senior copywriter at Crispin, Porter + Bogusky, working on Old Navy and Baby Carrots, before moving to Mullen Boston as associate creative director for Zappos and JetBlue. Hornaday replaces Jason Elm, who is leaving the agency.

As part of Corrigan's promotion, Barkley's experience design team will now report to him within the Blacktop design unit. He has worked for Barkley since 2004 and previously held the titles of vice president/interactive creative director, executive creative director, and design director. He replaces Blacktop founder Shawn Polowniak, who is leaving the agency.

Chandler is a familiar face to Wilkins, having worked with him at Naked Communications where he was the global business lead. Wilkins was a co-founder. More recently, he held consultancy roles working with companies including Virgin Airlines.

Meanwhile, Daniel Prestes joins in the newly created strategy director role working with CSO Sid McGrath on accounts including Clydesdale, Just Eat and Unibet. He reports to head of planning Will Hodge. The industry veteran has spent time at agencies in London, Amsterdam and Brazil, specializing in innovation as well as brand and digital planning.

Both executives will be based in London.

"The changing landscape of the communications industry has meant that agencies need to be able to react to the increased need of data informing and developing marketing strategies," says Wilkins. "Rob and Dan bring the expertise to keep us strategically ahead of the curve, enhancing Karmarama's existing skillset in digital, content and innovation."

Karmarama was acquired by Accenture late last year.

Her daily duties include overseeing digital and social outputs across clients like Sherwin-Williams, Green Giant and PNC Bank. Prior to Deutsch, Mercer worked at consulting firm The Upside in London as strategy & innovation director, building business opportunities for Adidas, Google and Kiehl's. She also worked in Deutsch's LA office, on the development of the Esurance Fuelcaster. In addition, she designed and developed products at CP+B and Mobelux.

"In a constantly shifting landscape, Rachel fluidly navigates digital platforms and consistently delivers compelling digital experiences for both consumers and brands," said Val DiFebo, CEO of Deutsch New York. "We're excited to acknowledge the significant impact she has made at Deutsch."