Publicis Chemistry's chief executive Mike Welsh will step down, and is moving to a non-executive, consulting role at the agency instead. The staff were told at a meeting last Friday. The management team will consist of David Prideaux, the executive creative director, Kevin Allen, the chief strategy officer and Emma Rush, the new head of client services. Welsh’s exit comes less than three months after the arrival of Guy Wieynk, the new group chief executive of UK and the Nordics for Publicis Worldwide.