Tosia Schneider was born to a Jewish family in Poland and spent her early childhood in the town of Zaleszczyki. When she was six, the family moved to her mother's hometown of Horodenka, where they had many close relatives. Her father was an accountant and her mother was a teacher. Tosia's happy childhood ended when she was 11 years old with the outbreak of World War II and the German invasion of Poland. In 1941, the Jews of her town were confined to a ghetto; her father was separated from the family and taken away. Tosia, her mother, and brother Julek were later put into the ghetto of Tluste. Her mother died of typhus and the siblings were left alone with two cousins. In 1943, she and Julek were deported to the forced labor camp of Lisowce. Julek and the other members of her immediate family were killed, and many of her extended family as well. She survived to be liberated by the Soviet army in March, 1944. In 1949, she emigrated to the USA, and the following year married Fred Schneider, with whom she had three sons. She became a teacher and retired after 30 years. Her memoir of the Holocaust,
Someone Must Survive to Tell the World, published in 2007, was named for a repeated phrase of her mother's and fulfilled the pledge Tosia made to her.