Elazar Shach

Elazar Menachem Man Shach (Hebrew: אלעזר מנחם מן שך, Elazar Shach; January 1, 1899 O.S. – November 2, 2001) was a Lithuania-born Israeli rabbi and posek. He was born in Vabalninkas (Vaboilnik in Yiddish), Lithuania, but his flee to Palestine for fear of the Holocaust.
RAbbi-saach was thought to be a very leading authority in Haredi Jewish society.