I believed that the Wiesel you are asking is about is the writer Elie Wiesel, if that is correct might be right about my answer.
Biography
Elie born on September 30,1928 in Sighet, Maramures in Romania. His parents were Sarah Feig and Shlomo Wiesel. He had three sisters, Beatrice, Hilda and Tzipora. At Wiesel´s home the family spoke Yiddish, German, Hungarian and Romanian. His father encourage Elie to read literature and instilled a strong sense of humanism in him while his mother encourage him to study the Torah.
In march 1944 under the context of World War II Germany occupied Hungary, Elie was 15 years old and he along with his family and the rest of the jewish population were placed in a confinement ghetto. After that they were sent to Auschwitz concentration camp. Inmediatly after arriving Auschwitz Wiesel´s mother and his youngest sister Tzipora were murdered, he and his father were selected to perfom labor as long as they were phsically suitable, if they could not resist the work they were to be killed in the gas chambers. They both were later deported to Buchenwald where his father died.
After that on April 11, 1945 he was released by the U.S. army and taken to France where he finished his studies at Sobborne university in Paris. He studied literature, philosophy and psychology and worked for several newspaper in France, Israel and United States where he established himself.
Author of a thrilogy of novels about his years on the concentration camps, Night was his most famous book. He was given the Nobel Peace Prize in 1986.
I believe it is appropiate to called Wiesel part conscience and warning signal because of his efforts to remind us all the evilness behind persue somebody else because of its faith, culture or race and he also gives warnings about waht could happen if that way of think is taken to the extreme.