The meaning of the twentieth century

Kenneth Ewart Boulding (; January 18, 1910 – March 18, 1993) was an English-born American economist, educator, peace activist, and interdisciplinary philosopher. Boulding was the author of two citation classics: The Image: Knowledge in Life and Society (1956) and Conflict and Defense: A General Theory (1962). He was co-founder of general systems theory and founder of numerous ongoing intellectual projects in economics and social science. He was married to sociologist Elise M. Boulding.