David Easton was a prominent political scientist known for his contributions to the field of political theory. He is best recognized for developing the systems theory of politics, which views political systems as a set of interrelated parts that function together. His work emphasized the importance of understanding how political systems operate and adapt to their environments. Easton also introduced the concept of "political support," which refers to the public's backing of political systems and institutions. His influential book, A Systems Analysis of Political Life, published in 1965, laid the groundwork for future research in political science and helped shape modern political analysis.