Founded in 1960, Baltimore Research has five research spaces and specialises in healthcare research, B2B, and low incidence consumer research.

Baltimore’s managing director Ted Donnelly and director of operations Heather Ashley-Collins have both been appointed as vice-president, client solutions.

The acquisition expands Schlesinger’s presence in the US, which includes offices in New York, Los Angeles, San Francisco, Chicago and Boston. Last year, the company took over Chicago-headquartered Shapiro+Raj’s qualitative fieldwork practice.

Steve Schlesinger, chief executive, Schlesinger Group, said: "The synergy between our companies, in terms of a client-centric approach, high-quality research services, and shared core values and culture, was a fundamental driver in this decision."

Baltimore Research provides access to "this important US market and supports our track record in delivering industry-leading solutions," Schlesinger added.

Ashley-Collins said: "Our clients will be able to benefit from the combined power of the Baltimore Research team, as well as Schlesinger Group’s extended qualitative and quantitative data collection reach, resources, and world-class facilities."

The financial terms of the deal were not disclosed.