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Mr Wynne replaces Graeme Milne, who retires from the board at the co-operative’s annual meeting tomorrow.
Alliance Group chairman Murray Taggart said Mr Wynne had extensive experience in agribusiness, including 20 years in the dairy industry, and would bring strong skills to the board.
"Mark has significant experience in global sales and marketing, business transformation and co-operatives. We are looking forward to him making a valuable contribution to the board," he said.
The co-operative’s annual meeting will be hosted online because of Covid-19 restrictions.