John Cornwell

John Cornwell is an accomplished executive with extensive experience in commercial and financial leadership. Currently serving as Chief Commercial Officer at Ace of Hearts and Chief Financial Officer at Buttermilk on a fractional basis, Cornwell has developed commercial and financial strategies while advising senior management. From 2014 to 2024, Cornwell held the position of Chief Commercial Officer at Ogilvy Worldwide, where responsibilities included leading commercial strategy and overseeing major global clients, alongside serving as CFO/COO during a significant restructuring. Cornwell's earlier roles at Ogilvy included Head of Finance Strategy & Operations and Finance Director, where achievements encompassed implementing turnaround plans across EMEA and driving exponential growth during challenging economic periods. A member of the Chartered Institute of Management Accountants, Cornwell’s leadership has consistently fostered operational excellence and commercial success.