The pioneering social reformer known for her work in women's rights is Elizabeth Cady Stanton. A key figure in the women's suffrage movement, she played an instrumental role in organizing the 1848 Seneca Falls Convention, where the Declaration of Sentiments was presented, asserting women’s demand for equal rights. Stanton advocated for women's education, property rights, and social reforms, emphasizing equality under the law. Throughout her life, she collaborated with other notable activists, such as Susan B. Anthony, to promote women's suffrage and gender equality, leaving a profound legacy that paved the way for future generations in the fight for women’s rights.