Sells will build the mobile offering at the agency, which has clients including TSB, easyJet and Dove.
Before setting up BBH’s mobile division and developing work for clients such as Barclays, Audi, KFC, Vodafone and Burberry, Sells worked in the interactive division of MTV, latterly as a senior programme manager for mobile.
The other hires include Simon Nixon, the former head of the sport division at digital agency Aqueduct, to look after Havas EHS’ technical delivery and user experience in the new role of technology director.
Brendon McCabe, the former director of production at StoryWorldwide, has joined Havas EHS in the new role of head of delivery. He will manage the project management team and look to improve the agency’s processes.
Sells, Nixon and McCabe will report to Matt Fanshawe who has taken responsibility for the London office, in addition to his existing roles of global brand director and group chief operating officer.
Havas EHS has also reorganised its Cirencester agencies so they are both under the responsibility of the managing director, David Williams. Olivier Janus, the former managing director of Havas EHS Discovery, has become the global data director.
The changes follow a year when Havas EHS has picked up new business from clients such as TSB, as well as additional work for existing clients including Nestlé. The agency claims its revenue has grown 20 per cent over the past year.
Tash Whitmey, the group chief executive of Havas EHS UK, said: "It’s an exciting time for Havas EHS. Some big wins and fantastic talent have put us on a new playing field altogether.
"The significant growth we’ve seen puts us in a strong position for 2014 and these senior hires are transforming the way we will deliver into the future. Peter, Simon and Brendon are exceptional individuals who each bring a wealth of knowledge and experience to the company and will move our unique FULCRM proposition forward."