Group M names Claire Butterworth interim general manager of investment, recruitment ongoing February 17, 2021 9:12 Group M has named MediaCom’s Claire Butterworth interim general manager of investment in lieu of a replacement for chief investment officer Nicola Lewis being appointed. Interim general manager of investment Claire Butterworth ADVERTISEMENT As interim general manager of investment, Butterworth will take on responsibility for GroupM’s investment and partnerships function, working with the CEOs and investment leads of Mindshare, MediaCom, Wavemaker and Essence to drive value for clients and leveraging modern investment and partnership services. Butterworth, the chief investment officer at MediaCom, will also continue to work closely with the agency’s team.