Publicis London’s chief strategy officer, Dom Boyd, is departing the agency.
Boyd, who joined from Adam & Eve/DDB in 2017, is leaving next month to "pursue other opportunities", the agency said.
Nick Farnhill, chief executive of Publicis Worldwide UK, has chosen not to replace Boyd amid plans to make further changes at the agency.
"We would like to thank Dom for his commitment to the business over the past two years and we wish him all the best in his next endeavour," Farnhill said. "Publicis Worldwide UK is about to start an exciting new chapter and we look forward to sharing this soon."
Boyd is credited with helping lead Publicis to win new business such as Cathay Pacific, P&O Ferries and Lastminute.com.
He was also central to the agency’s Rare Thinking Sessions initiative, in which Publicis showcases innovative ways of creating "future-fit" brands.
Boyd said: "It’s been a brilliant experience leading Publicis over the last two years – we’ve shaped an agency focused on creating rare connected experiences, built a DataScience practice, won great new clients, made some great work and picked up multiple IPA Effectiveness and creative awards. The time is now right for a new challenge and I wish Nick and team every success in the future."