"This article is about the mathematician Marie-Sophie Germain. For the number theory (set, or predicate), see Sophie Germain prime."Marie-Sophie Germain (April 1, 1776 – June 27, 1831) was a French mathematician, physicist, and philosopher who made important contributions to differential geometry and number theory. She was born in 1776 in an era of revolution. In the year of her birth, 1776, the American Revolution began. In many ways Sophie embodied the spirit of revolution into which she was born. She was a middle-class female who went against the wishes of her family and the social prejudices of the time to become a highly recognized mathematician. Like the member of a revolution, her life was full of perseverance and hard work. It took a long time for her to be recognized and appreciated for her contributions to the field of mathematics, but she did not give up. Even today, it is felt that she was never given as much credit as she was due for the contributions she made in number theory and mathematical physics because she was a woman.