Thomas Robert Malthus is a renowned English economist, demographer, and scholar who has made significant contributions to the fields of economic theory, sociology, and political science. Malthus is best known for his theory of population, which holds that population growth will ultimately outpace food production, leading to widespread famine and social unrest. Synonyms for Malthus include "Malthusian" and "neo-Malthusian," which are used to describe theories or policies related to population growth and resource management. Additionally, Malthus was a pioneer in the field of political economy, and is often referred to as a classical economist along with Adam Smith and David Ricardo.