David Breen Seymour is a New Zealand politician serving as the Member of Parliament for Epsom and Leader of ACT New Zealand since 2014.
A graduate of the University of Auckland, Seymour worked in public policy in Canada, before returning to New Zealand and contesting for election to Parliament. He entered the House of Representatives in 2014 as ACT's sole MP, after which he was elected as party leader, replacing Jamie Whyte. Seymour has embraced libertarian social policies since becoming party leader, such as supporting the legalisation of assisted dying, and introduced a bill on this issue. Seymour has appeared extensively on television during his leadership.