William H. Riker
Encyclopedia
William Harrison Riker (September 22, 1920 – June 26, 1993) was an American political scientist who applied game theory
Game theory
Game theory is a mathematical method for analyzing calculated circumstances, such as in games, where a person’s success is based upon the choices of others...

 and mathematics
Mathematics
Mathematics is the study of quantity, space, structure, and change. Mathematicians seek out patterns and formulate new conjectures. Mathematicians resolve the truth or falsity of conjectures by mathematical proofs, which are arguments sufficient to convince other mathematicians of their validity...

 to political science.

Riker was born in Des Moines, Iowa
Des Moines, Iowa
Des Moines is the capital and the most populous city in the US state of Iowa. It is also the county seat of Polk County. A small portion of the city extends into Warren County. It was incorporated on September 22, 1851, as Fort Des Moines which was shortened to "Des Moines" in 1857...

, earned his Bachelor's Degree in political science at Indiana's DePauw University
DePauw University
DePauw University in Greencastle, Indiana, USA, is a private, national liberal arts college with an enrollment of approximately 2,400 students. The school has a Methodist heritage and was originally known as Indiana Asbury University. DePauw is a member of both the Great Lakes Colleges Association...

 and received his Ph.D at Harvard University
Harvard University
Harvard University is a private Ivy League university located in Cambridge, Massachusetts, United States, established in 1636 by the Massachusetts legislature. Harvard is the oldest institution of higher learning in the United States and the first corporation chartered in the country...

 in 1948. He took on a professorship at Lawrence University
Lawrence University
Lawrence University is a selective, private liberal arts college with a nationally recognized conservatory of music, in Appleton, Wisconsin. Lawrence University is known for its rigorous academic environment. Founded in 1847, the first classes were held on November 12, 1849...

 in Appleton, Wisconsin
Appleton, Wisconsin
Appleton is a city in Outagamie, Calumet, and Winnebago Counties in the U.S. state of Wisconsin. It is situated on the Fox River, 30 miles southwest of Green Bay and 100 miles north of Milwaukee. Appleton is the county seat of Outagamie County. The population was 78,086 at the 2010 census...

 (then Lawrence College), where he published The Theory of Political Coalitions
The Theory of Political Coalitions
The Theory of Political Coalitions is a book on positive political theory written by William H. Riker published in 1962. It uses game theory to formalize political theory. In it, Riker deduces the size principle. On its postulates, politicians are proved to form winning, minimal-size coalitions...

(1962). In 1962, he became the chair of the Political Science Department at the University of Rochester
University of Rochester
The University of Rochester is a private, nonsectarian, research university in Rochester, New York, United States. The university grants undergraduate and graduate degrees, including doctoral and professional degrees. The university has six schools and various interdisciplinary programs.The...

, where he remained chair until 1977, and remained active until his death.

He founded the now-mainstream field of positive political theory
Positive political theory
Positive political theory or explanatory political theory is the study of politics using formal methods such as social choice theory, game theory, and statistical analysis. In particular, social choice theoretic methods are often used to describe and analyze the performance of rules or institutions...

, which introduced game theory
Game theory
Game theory is a mathematical method for analyzing calculated circumstances, such as in games, where a person’s success is based upon the choices of others...

 and the axiomatic method of social choice theory
Social choice theory
Social choice theory is a theoretical framework for measuring individual interests, values, or welfares as an aggregate towards collective decision. A non-theoretical example of a collective decision is passing a set of laws under a constitution. Social choice theory dates from Condorcet's...

 to political science
Political science
Political Science is a social science discipline concerned with the study of the state, government and politics. Aristotle defined it as the study of the state. It deals extensively with the theory and practice of politics, and the analysis of political systems and political behavior...

. Bruce Bueno de Mesquita and Kenneth Shepsle in their Memoir write that "These have proved crucial to predictive tests for political theory."

Among other contributions, he is known for work on the theory and history of federalism
Federalism
Federalism is a political concept in which a group of members are bound together by covenant with a governing representative head. The term "federalism" is also used to describe a system of the government in which sovereignty is constitutionally divided between a central governing authority and...

 and on something he called "heresthetics" - the art politicians use when they change political outcomes without changing peoples' underlying preferences, for example by manipulating the order in which decisions are made.

The William H. Riker Prize for excellence in undergraduate teaching is awarded by the University of Rochester bi-annually in his honor. The Political Economy section of the American Political Science Association awards an annual book prize in his name as well.

See also: Duverger's law
Duverger's law
In political science, Duverger's law is a principle which asserts that a plurality rule election system tends to favor a two-party system. This is one of two hypotheses proposed by Duverger, the second stating that “the double ballot majority system and proportional representation tend to...


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