Since November 2020 (this term).
Whangaparāoa replaced the Rodney electorate on 17 April 2020. You can see the former MPs for that electorate on that electorate page, but be wary of boundary changes that may have occurred since then.
Image of Mark Mitchell: Public domain (United States Embassy, New Zealand / Department of State)
Dates sourced from a variety of sources including the Parliament website, Hansard, and Wikipedia. Start dates shown correspond to when an MP was sworn in, not when that MP was declared elected.