The influential American sociologist who documented the lives of the urban poor is Jane Addams. As a pioneer in social work and a prominent figure in the settlement house movement, Addams co-founded Hull House in Chicago. Her studies on poverty emphasized the need for systemic change and social justice, advocating for improved conditions for immigrants and the working class. Addams's work highlighted the intersection of sociology and public policy, promoting ideas on community organization and the importance of direct engagement with marginalized populations. Her contributions laid foundational principles for modern social welfare practices.