M&C Saatchi MD Russell Hopson replaced by Sian Cook and Michael McEwan March 15, 2021 11:29 M&C Saatchi Australia group managing director Russell Hopson has departed the business after four years. Hopson has served in the role since 2017, and it has been revealed he will be replaced by Sian Cook and Michael McEwan, who’ll serve as joint managing directors. Cook steps up from her current role as M&C Saatchi Sydney managing partner, while McEwan was the managing director for the Melbourne hub of the business. Mumbrella understands that Hopson is taking some time off before considering his next career move.