Le Duc Tho(1911 - 1990) was a member of the Politburo of the Democratic Republic of Vietnam. While he was listed as "special adviser", he was actually the head of the DRV delegation to the Paris Peace Talks, conducting the real negotiations with Henry Kissinger while speeches were made at the official talks.
He was awarded, but refused, the Nobel Peace Prize for the settlement; it was a joint award to Kissinger as well.