Ella Vogelaar, chair of MN’s supervisory board, said MN faced important innovation challenges for pensions administration, cost saving and quality improvement.
Based in London, he will report to Patric Foley-Brickley, Head of Business Development & Client Management - Europe.
Flint thanked Mackay, 56, for his 11 years of service, eight of which were in his current role. Specific retirement and appointment dates will be confirmed in due course, HSBC added.
He left the firm last year, after Barclays hired Rupert Jones, Morgan Stanley's former head of European equity research to replace him.
Now 65, the Swiss banker-elder statesman is back on the scene as chairman of Zurich's Private Client Bank, or PCB, according to the company's website.
Aviva also said Colin Williams, managing director of workplace benefits at Aviva, will be stepping down from the IGC to create a fully independent committee.