John Cornwell

John Cornwell currently serves as Chief Financial Officer at Buttermilk, beginning in January 2025. Prior to this role, John held the position of Chief Commercial Officer at Ogilvy Worldwide from March 2014 to December 2024, where responsibilities included leading commercial strategy, overseeing major global clients, and navigating significant restructuring efforts. John's earlier experience at Ogilvy from 1995 to 2014 encompassed various financial leadership roles, including Head of Finance Strategy & Operations for EMEA, Finance Director of OgilvyOne WW, and Commercial Manager, contributing to substantial business growth and operational improvements during challenging periods. John's professional qualifications include membership in the Chartered Institute of Management Accountants.