Elijah ben Solomon Zalman,, also known as the Vilna Gaon, was a Lithuanian Jewish talmudist, halakhist, kabbalist, and the foremost leader of misnagdic Jewry of the past few centuries.
Vilna Gaon, Winograd picture
A portrait attributed to the Vilna Gaon
A street sign named after the Vilna Gaon in Vilnius
A commemorative plaque in Vilnius at the site where the Vilna Gaon's house once stood, inscribed: "The Gaon Eliyahu of Vilna lived in the house that stood here."
In Jewish law and history, Acharonim are the leading rabbis and poskim living from roughly the 16th century to the present, and more specifically since the writing of the Shulchan Aruch in 1563 CE.
Vilna Gaon
…texts, he became one of the most familiar and influential figures in rabbinic study since the Middle Ages. Although he is chronologically one of the Acharonim, some have considered him one of the Rishonim. Large groups of people, including many yeshivas, uphold the minhag (set customs and rites) named after…