This document provides brief biographies of influential sociologists including Emile Durkheim, known as the "father of sociology" for making it a science; Max Weber, known for his thesis on the Protestant work ethic and ideas on bureaucracy; Karl Marx, known for developing Marxism which examines society, economics, and politics through class struggle; and others such as Charles Cooley, George Herbert Mead, Auguste Comte, Herbert Spencer, W.E.B. Du Bois, Alexis de Tocqueville, and Georg Simmel who made important contributions to the development of sociology.