First, your comment about the Prime Minister is unfair.
Mr. Carney was a member of the public service of Canada. He was governor of the Bank of Canada. He was the first non-British governor of the Bank of England. He spent most of his life in the public sector, much more so than in the private sector.
Mr. Carney has extensive experience in the public sector. It's true that he worked in the private sector recently. However, he spent far less time there than he has in the public sector.