Elijah ben Solomon Zalman, known as the Vilna Gaon or Elijah of Vilna, or by his Hebrew acronym HaGra or Elijah Ben Solomon , was a Talmudist, halakhist, kabbalist, and the foremost leader of misnagdic Jewry of the past few centuries. He is commonly referred to in Hebrew as ha-Gaon he-Chasid mi-Vilna, "the pious genius from Vilnius".Through his annotations and emendations of Talmudic and other texts, he became one of the most familiar and influential figures in rabbinic study since the Middle Ages, counted by many among the sages known as the Acharonim, and ranked by some with the even more revered Rishonim of the Middle Ages. Large groups of people, including many yeshivas, uphold the set of Jewish customs and rites , the "minhag ha-Gra", which is named for him, and which is also considered by many to be the prevailing Ashkenazi minhag in Jerusalem.
Born in Sielec in the Brest Litovsk Voivodeship , the Gaon displayed extraordinary talent while still a child. By the time he was twenty years old, rabbis were submitting their most difficult halakhic problems to him for legal rulings. He was a prolific author, writing such works as glosses on the Babylonian Talmud and Shulchan Aruch known as Bi'urei ha-Gra , a running commentary on the Mishnah, Shenoth Eliyahu , and insights on the Pentateuch entitled Adereth Eliyahu , published by his son. Various Kabbalistic works have commentaries in his name, and he wrote commentaries on the Proverbs and other books of the Tanakh later on in his life. None of his manuscripts were published in his lifetime.
When Hasidic Judaism became influential in his native town, the Vilna Gaon joined the "opposers" or Misnagdim, rabbis and heads of the Polish communities, to curb Hasidic influence. In 1777, one of the first excommunications against the nascent Hasidic movement was launched in Vilna.
He encouraged his students to study natural sciences, and even translated geometry books to Yiddish and Hebrew. Wikipedia
Commentary on Mishlei 23:30, as cited in "Separation from the Worldly (Perishut)" http://etzion.org.il/en/separation-worldly-perishut
Alim li-Terufa as cited in "Separation from the Worldly (Perishut)" http://etzion.org.il/en/separation-worldly-perishut
