Elie Wiesel, the Auschwitz survivor who became an eloquent witness for the six million Jews slaughtered in World War II and who, more than anyone else, seared the memory of the Holocaust on the world’s conscience, died on Saturday at his home in Manhattan. He was 87.

Menachem Rosensaft, a longtime friend and the founding chairman of the International Network of Children of Jewish Holocaust Survivors, confirmed the death in a phone call.

Mr. Wiesel, a charismatic lecturer and humanities professor, was the author of several dozen books. In 1986, he was awarded the Nobel Peace Prize. But he was defined not so much by the work he did as by the gaping void he filled. In the aftermath of the Germans’ systematic massacre of Jews, no voice had emerged to drive home the enormity of what had happened and how it had changed mankind’s conception of itself and of God. For almost two decades, the traumatized survivors — and American Jews, guilt-ridden that they had not done more to rescue their brethren — seemed frozen in silence.

But by the sheer force of his personality and his gift for the haunting phrase, Mr. Wiesel, who had been liberated from Buchenwald as a 16-year-old with the indelible tattoo A-7713 on his arm, gradually exhumed the Holocaust from the burial ground of the history books.

It was this speaking out against forgetfulness and violence that the Nobel committee recognized when it awarded him the peace prize in 1986. ...