Semih Mavis, the chief executive of Netherlands-based Efes Breweries International is to step down as chief executive after three months in the role. Mavis will join the Efes Beer Group as the chief operating officer for Turkey with responsibility for all Turkey beer operations effective from 15 August. Ahmet Boyacioglu, who currently is the chairman of EBI, will be the acting chief executive until an Extraordinary General Meeting, the date for which has not yet been announced.