The American social reformer known for establishing Hull House is Jane Addams. Founded in Chicago in 1889, Hull House was a pioneer settlement house aimed at helping immigrants and the poor. Addams focused on providing educational programs, social services, and cultural opportunities to the local community. She was a strong advocate for social justice, women's rights, and peace. Addams' work at Hull House earned her prestigious recognition, becoming the first American woman to win the Nobel Peace Prize in 1931. Her legacy continues to inspire social reform and community service initiatives today.