The agency, which won PRWeek's New Consultancy of the Year award last month, has appointed Florence Quirici as a partner.
She will support the expansion of Pagefield Diplomat, which provides comms consultancy for international clients.
Quirici joins after six years at Bloomberg, with the aim of growing the division under the strategic advice and leadership of Sir Christopher Meyer, the former British ambassador to the US and chairman of Pagefield's advisory board.
