Marshall quit to become head of policy and comms at the Association of British Travel Agents in place of Keith Betton (PRWeek, 4 August).
The IoD has split his responsibilities between head of European regulatory affairs James Walsh - who becomes head of public affairs - and head of media relations Caroline Fanaroko.
The pair report to IoD director-general Miles Templeman alongside chief economist and director of policy Graeme Leach and head of corporate governance and employment Patricia Peter.
‘These changes allow us to achieve a much closer integration between communications and policy work,' said Fanaroko. ‘The objective is to secure a higher profile for the IoD and more influence for the policy reports and comments that we produce on behalf of our members.'