Grant Murray Robertson (born 30 October 1971) is a New Zealand politician and Member of Parliament. He has represented the Labour Party in the seat of Wellington Central since the 2008 general election.Robertson was elected Labour's deputy leader in 2011, under leader David Shearer. He contested the leadership of the party in a 2013 leadership election that was won by David Cunliffe, and was replaced as deputy leader by David Parker.He is currently Labour's finance spokesperson.