Translation of "formateur" into English

Politician who leads the formal talks that lead to the formation of a cabinet, often the leader of the largest party. Often the formateur presides the talks about the ministerial positions that are held between the parties that have already written a communal program, the 'regeerakkoord'. The formateur's work is preceded by the 'informateur'. Neither of these positions is described in any law, instead they are part of Dutch political tradition. The formateur is appointed by the monarch. As the leader of the largest party, the formateur usually becomes prime minister.