"Kaplan joined the [[University of Chicago]]’s Department of Political Science in 1956. During the 1950s and 1960s, he was one of the foremost international relations scholars in the world and a central figure in the development of systems theory. His most prominent contribution was detailed in his 1957 book, System and Process in International Politics, in which he introduced a scientific framework for studying international systems, an approach that challenged existing methodologies at the time...
"In addition to his seminal work on systems theory, he communicated prolifically on numerous topics in political science, writing or editing 30 books and over 100 articles, including: Science, Language and the Human Condition; The Political Foundations of International Law; The Rationale for NATO; Justice, Human Nature, and Political Obligation; and The Soviet Union and the Challenge of the Future. He was also active in a number of professional groups, including as president of the Professors [[Professors World Peace Academy]] International, as a member of the editorial advisory board of the [[Washington Times]], as the editor of the magazine [[World & I]], and as a consultant for the National Endowment for the Humanities, among myriad other positions and memberships he held throughout his career and well into his retirement.
"Prior to joining the University of Chicago, Kaplan graduated with a bachelor’s degree in political science from Temple University in 1943 and then served in the United States Army from 1943–1946. He earned his PhD from Columbia University in 1951. Between 1951 and 1956, he was a political science instructor at The Ohio State University, an assistant professor of political science at Haverford College, and a staff member at the [[Brookings Institution]].