In subsequent publications ("Power and Privilege", 1966; "Human Societies", 1970; and "Ecological-Evolutionary Theory", 2006), Lenski built on the foundations of evolutionary theory laid in the 18th century by A.R.J. Turgot, Adam Ferguson, John Millar, and Thomas Malthus, and in the 19th and 20th centuries by Lewis Henry Morgan, Leslie White, and Charles Darwin and the many biological evolutionists following him, to propose a more contemporary ecological and evolutionary theory of societal development from the Stone Age to the present. He has viewed the cumulation of information, especially technological information, as the most basic and most powerful factor in the evolution of human societies (though not the only one, as some of his critics have claimed). Lenski has argued that the evolution of cultural information is an extension of the evolution of genetic information with the characteristics of human societies being the product of the interaction of both genetic and cultural influences.