From his foundation web site:
Elie Wiesel was born in 1928 in Sighet, Transylvania, which is now part of Romania. He was fifteen years old when he and his family were deported by the Nazis to Auschwitz. His mother and younger sister perished, his two older sisters survived. Elie and his father were later transported to Buchenwald, where his father died shortly before the camp was liberated in April 1945.
After the war, Elie Wiesel studied in Paris and later became a journalist. During an interview with the distinguished French writer, Francois Mauriac, he was persuaded to write about his experiences in the death camps. The result was his internationally acclaimed memoir, Night (La Nuit), which has since been translated into more than thirty languages