"There were many who thought this was unpatriotic to say the least," she said. "It was quite the reverse. He loved this country."
Chayes continued working until right up until the end of his life.
In 1999, he was part of a committee of international legal experts that advised the government of Bosnia- Herzegovina on issues of corruption.
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"He was simply a life force. They don't come like that often," Slaughter said.
Chayes is survived by his wife, Antonia Handler, five children and a sister.
A memorial service will be held at Harvard at a later date.