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Monsieur Chouchani (? - 1968), or "Shushani," is the nickname of an otherwise anonymous and enigmatic Jewish teacher who taught a small number of distinguished students in post-World War II Europe and elsewhere, including Emmanuel Levinas and Elie Wiesel.
Not much is known about "M. Chouchani," including his real name, a secret which he zealously guarded. His origins are completely unknown, and his gravestone (located in Montevideo, Uruguay, where he died in January 1968) reads, "The wise Rabbi Chouchani of blessed memory. His birth and his life are sealed in enigma." The text is by Elie Wiesel who paid for this gravestone. The name "Shushani," which means "person from Shushan," is most probably an allegorical reference, or possibly a pun. Elie Wiesel hypothesizes that Chouchani's real name was Mordechai Rosenbaum, while Hebrew University professor Shalom Rosenberg asserts that Chouchani's actual name was Hillel Perlmann.
Although there is no known body of works by Chouchani himself, there is a very strong intellectual legacy seen in the influence on his pupils. By all accounts, Chouchani had the appearance of a vagabond and yet was reputed to be a master of vast areas of human knowledge, including science, mathematics, philosophy and especially the Talmud. Most of the biographical details of Chouchani's life are known from the works and interviews of his various students, as well as anecdotes of people whom he encountered during his lifetime.
Chouchani appeared in Paris after the Second World War, where he taught between the years of 1947 and 1952. He disappeared for a while after that, evidently spent some time in the newly-formed state of Israel, returned to Paris briefly, and then left for South America where he lived until his death.
A French journalist named Salomon Malka wrote a 1994 book about him, entitled "Monsieur Chouchani: L'énigme d'un maître du XXe siècle" (Mister Shushani: The riddle of a teacher of the 20th century).
Chouchani and Levinas 
Emmanuel Levinas's first encounter with Chouchani and their subsequent relationship, is summarized as follows:
- In 1945 Levinas closest friend, Dr. Henri Nerson a Jewish obstetrician, told him about an outstanding and quite bizarre individual he came to know during the years of the War in the area of Vichy. The man was so unusual that even his real name was not known. He used to be called Chouchani but this was more of a nickname than his true one. His external appearance was quite unpleasant, some say even repugnant. However, according to Nerson his knowledge was phenomenal. Nerson, who was known for his sober way to apprehend people and situations, was clearly in a state of excitement as if he would have become an adept of some sect. He strongly recommended to Levinas to meet Chouchani, but for two years Levinas refused. After all (...) Levinas was quite suspicious as to what this "clochard" looking man could contribute to him. Finally in 1947 Levinas agreed to meet Chouchani. We know very little about the meeting itself. But there exists a myth. The myth suggests that they met for an entire night, and in the morning Levinas said to Nerson as he was about to leave: "I can not tell what he knows, all I can say is that all that I know, he knows". Be the accuracy of this myth as it may, one fact remains indisputable. From then on, Levinas became interested in the study of Talmud to a point where most of his free time, he would devote to studying it.
- For the next five years Levinas studied at length with Chouchani. Alone, with Nerson and in a weekly study group that would study Talmud and which included in addition to them a small group of friends. In 1952 Chouchani left France for Israel, and came back in 1956 for about six months before leaving Europe definitely for South America where he remained until his death in 1968. 
The influence of Chouchani on Levinas is most strongly felt in Levinas' famous series of Talmudic Readings. Levinas acknowledged that influence only late in his life. Levinas was powerfully impressed by Chouchani's total mastery of the texts, commentaries and meta-commentaries, as well as Chouchani's ability to "widen" the scope of the Talmud, using creative, dialectic methodology. One hallmark of the "Chouchani Style" in Levinas' work is the method by which the interpretation of a text is understood not just by the words of a particular citation, but rather the entire context of that citation. Levinas' hermeneutical expositions on the Talmud, which he credits to his "master," manage to be simultaneously traditional and radical in feeling. As a result of his learnings with Chouchani, Levinas sees the ancient text of Talmud and its multiple layers of subsequent commentary not merely as a place where "all that can ever be thought has been thought of already," but also as a framework for his reconciliation of ethics, phenomenology and postmodernity.
Chouchani and Wiesel 
Elie Wiesel described his initial 1947 encounter with Chouchani in "Legends of Our Times" (Chapter 10). Wiesel writes that Chouchani was "dirty," "hairy," and "ugly," a "vagabond" who accosted and berated him in Paris in 1947, and then became his mentor. Wiesel wrote of him again in his memoir "All Rivers Run to the Sea" (pp. 121–130). Wiesel credits Chouchani as being one of his most influential teachers.