Morton left Publicis Group UK to move to the US with his wife Sarah Watson, who resigned as head of planning at DDB UK in May to become chief strategy officer of Bartle Bogle Hegarty in New York.
In his new role at Euro RSCG, Morton will be responsible for the agency's department of multi-disciplinary planners and he will work across Euro RSCG New York’s clients, including Kraft Foods and Reckitt Benckiser.
He will also be charged with developing Euro RSCG’s "commitment to innovation" through new strategic tools, insights and initiatives.
At Publicis, Morton had responsibility for planning and developing strategy across Publicis London, Publicis Modem, Publicis Dialog and Publicis Blueprint, and was the first chief strategy officer to work across the group.
Before joining Publicis in September 2010, Morton was executive planning director at TBWA, working across clients such as Apple, British Airways, Mars, PlayStation and Nissan.
Morton joined TBWA as head of planning on the Sony PlayStation business in February 2005 from Rainey Kelly Campbell Roalfe/Y&R, where he was deputy planning director. He started at RKCR/Y&R in August 2001.
After beginning his career in financial PR at Square Mile Communications in 1995, Morton moved to DDB as a planner in 1996. At DDB for five years, Morton worked across clients such as Reuters, New Labour, Sony and Barclaycard.
Brooks said: "Tom has all you'd expect in a top-notch planner. He understands how to take observations and turn them into powerful insights, brings a wealth of experience across client industries, and has a strong command of the digital and social universe.
"But perhaps his greatest asset is his inherent curiosity about broader cultural trends and their impact on brands. That's a critical component of what we were looking for in our chief strategy officer."
Morton will start at Euro RSCG in early September. He said: "The opportunity at Euro New York is massive. There's so much to work with – the baked-in digital capabilities, the Future First positioning, the moxie of the people I've met.
"I'm going to enjoy building a planning culture to match the agency's ambitions."