Clark (pictured) joined Ipsos Mori in 2003, later becoming head of political research in the UK, and relocated to Washington, DC in 2010 to work in the company’s public affairs division.

Since 2013, she has been based in Chicago, running Ipsos’ polling and public opinion business, a range of commercial client relationships, and most recently its work for the US Department of Defense.

In the new role, effective immediately, Clark will work across Ipsos’ North America team. The company said it has created the position as part of its efforts to "leverage its momentum as a professional services firm and its increased scale".

Pierre Le Manh, global deputy chief executive and Ipsos North America chief executive, said: "Julia has a long track record of outstanding delivery for Ipsos’ clients, colleagues, and stakeholders, and has been a trusted brand protector and ambassador for our organisation for over 15 years.

"Her experience in multiple Ipsos offices and countries, as well as her origin within our public sector and nonpartisan polling business have given her a deep and wide understanding of our business and the public who operate within and around it."