The author of an alternative Jacinda Ardern biography says his book's different - because he's spoken to people across politics. 

The Former Prime Minister's memoir, A Different Kind of Power, hit shelves last week. 

David Cohen says he's writing his own book, backed by alternative news website, the Centrist.

He expects it'll be out later this year.

He says he's proud of the fact it brings in a multitude of voices - which he claims other Ardern biographies haven't done.

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