Hayman will act as an ambassador for the bank and he will work closely with the institution's increasing number of entrepreneur clients.
Hayman co-founded public relations consultancy Seven Hills in January alongside ex-Text 100 UK MD Nick Giles and will take up the Coutts & Co roles in addition to his consultancy work.
Commenting on Hayman's appointment, Andrew Haigh, managing partner of the entrepreneur group at Coutts, said: ‘Michael is a highly visible player in the entrepreneur space. He has an outstanding reputation as an adviser, thinker and innovator.
'We have worked closely with him in developing our entrepreneur proposition in the past and he will represent the bank as an ambassador in the future. He is a welcome and important addition to the entrepreneur group.'
He has previously authored Face Value for Coutts & Co, which looked at business leaders, brands and reputation. Before setting up Seven Hills he was chief executive of The Communications Group and prior to entering public relations was a parliamentary aide and a consultant to the Foreign and Commonwealth Office.
Hayman commented: ‘I am delighted to be joining Coutts at an exciting time for the bank in particular and entrepreneurs in general. With the economy showing the first important glimmers of upturn it will be entrepreneurs who will be on the front line of wealth creation and the economic fight back. To be successful they will need smart advisers for this journey. Coutts is the nation's bank for successful entrepreneurs and I feel greatly privileged to represent it in this new role.'