Robert Nozick (November 16, 1938 – January 23, 2002) was an American political philosopher, most prominent in the 1970s and 1980s. He was a professor at Harvard University. He is best known for his book Anarchy, State, and Utopia (1974), a libertarian answer to John Rawls's A Theory of Justice (1971). His other work involved decision theory and epistemology.

Nozick was born in Brooklyn, the son of a Jewish entrepreneur from the Russian shtetl who had been born with the name of Cohen. Nozick was married to the poet Gjertrud Schnackenberg. He died in 2002 after a prolonged struggle with stomach cancer. He is interred at Mount Auburn Cemetery in Cambridge, Massachusetts.

Nozick was educated at Columbia (A.B. 1959, summa cum laude), where he studied with Sidney Morgenbesser, and later at Princeton (Ph.D. 1963), and Oxford as a Fulbright Scholar (1963-1964).

Jeff Riggenbach (born January 12, 1947) is an American libertarian journalist, author, editor, broadcaster, and educator.

Riggenbach's first book, In Praise of Decadence (1998), argued that the baby boomers turned out to be far more libertarian in their personal philosophy than had been expected.

His second book, Why American History Is Not What They Say: An Introduction to Revisionism (2009), argued that political events and trends in late 20th Century America had led to a rebirth of popular interest in revisionist accounts of American history. In this study of American revisionists, Riggenbach identifies three distinct phases within American revisionism.