Who was represented the US in peace talks?

In various peace talks throughout history, different U.S. representatives have played key roles. For example, during the Vietnam War, Secretary of State Henry Kissinger and North Vietnam's Le Duc Tho negotiated the Paris Peace Accords in 1973. In more recent times, U.S. diplomats such as John Kerry were involved in the Iran nuclear deal negotiations. Each instance reflects the changing diplomatic landscape and the specific context of the conflicts being addressed.