England-Hall left the Publicis-owned agency in November last year. He was not directly replaced, but the agency's chief operating officer, Chris Mellish, was promoted to managing director.
At Syncapse, which employs 40 social technology professionals in its London office, England-Hall will be responsible for the growth of business across Europe, through acquisitions and new client development.
Syncapse is focused on bringing its social media management software, the Syncapse PlatformT, to more brands across Europe.
The company recently raised $25m from institutional venture capital firm, ABS Capital Partners, and plans to add 100 new employees in 2011 across offices in London, Toronto, New York, Portland and San Francisco.
Michael Scissons, founder and chief executive at Syncapse, said: "Syncapse is entering a phase of rapid growth and Stephen's experience leading high-performance teams across Europe makes him a valuable addition to our company."