Claim: Grant Robertson worked as deputy prime minister and minister of finance under Prime Minister Jacinda Ardern.
Evidence: Jacinda Ardern Jacinda Ardern 
Grant Murray Robertson (born 30 October 1971) is a New Zealand politician and member of the Labour Party who has served as Deputy Prime Minister of New Zealand since 2020 and Minister of Finance since 2017. Jacinda Kate Laurell Ardern (/dʒəˈsɪndə ˈɑːrdɜːrn/; born 26 July 1980) is a New Zealand politician who has been serving as the 40th prime minister of New Zealand and leader of the Labour Party since 2017.