On Saturday Roger D. Fisher died. The author of Getting to Yes: Negotiating Agreement Without Giving In, used his focus on mutual interest to help resolve conflicts between Egypt and Israel, to end apartheid in South Africa and to end the hostage crisis in Iran.

He wasn't invited to to most of these conflicts, according to The New York Times. He just went.

"Our sense growing up," says his son Elliott, "was that he would read the newspaper and think, 'Oh, shoot, there is something to fix.'"

And Fisher's Harvard colleague John Kenneth Galbraith once toasted him by saying, "Whenever I thought, 'Someone should do something about this,' it eased my conscience to learn that Roger was already working on it."

Who will take his place?