This document provides an overview of several influential theorists in development economics and sociological/political development theories. It summarizes the key contributions and perspectives of thinkers such as Adam Smith, David Ricardo, Thomas Malthus, Karl Marx, Joseph Schumpeter, and others. It also examines the origins and perspectives of sociological theorists including Auguste Comte, Emile Durkheim, Max Weber, and Talcott Parsons. The document analyzes how their work has shaped the study of development economics and sociology.