Catherine West has resigned as Nine Entertainment chair less than 18 months after starting the role and will be replaced by former deputy chair of the ABC Peter Tonagh, who will take on the top job after joining the Nine board earlier this year.

West was appointed chair in June last year, replacing Peter Costello, and was tasked with leading the company’s culture review. She will formally resign at the company’s annual meeting on November 7.

West, who has served on the Nine board since 2016, said she was “proud to have successfully led the company through a transformational period”, finding that a refreshed executive team and operating model had positioned the company for “growth and the creation of shareholder value”.

Tonagh will take the reins in November, less than 12 months after jo

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