(TheDrinksBusiness) - Mackay (pictured) will replace the current chairman Meyer Kahn, who has been at the helm of the brewing giant since it floated in 1999. Mackay will in turn be replaced by fellow South African Alan Clark, currently director of Europe, who will spend a year as chief operating officer before taking over as chief executive in July 2013. Mackay will assume the role of non-executive chairman at that time as well. SABMiller admitted that the move was against the code but insisted that it was done in the best interests of shareholders.