约翰·密尔（John Stuart Mill, 1806-1873），生于英国伦敦，英国哲学家、经济学家、著名的自由主义法学家。自幼在父亲的严厉管教下受教于英国和法国，为《旅行者》、《编年史早报》、《威斯敏斯特评论》、《法学家》等刊物撰稿多年后，应聘主编《伦敦评论》。在此期间的著述后被收入《论文集》中（1859）。密尔主要著作有《逻辑方法》（1843）、《政治经济学原理》（1848）、《妇女屈从》（1869）、《论自由》（1859）、《代议制政府》（1861）等。其中《代议制政府》是西方第一部论述代议制的专著，是密尔政治思想特别是国家理论的一部重要著作。约翰.密尔的代议制理论主要包括代议制政府的形式、职能、民主制、选举权、议会以及地方代表机关和民族等问题。

Since its first publication in 1859, few works of political philosophy have provoked such continuous controversy as John Stuart Mill's "On Liberty", a passionate argument on behalf of freedom of self-expression. This classic work is now available in this volume which also includes essays by scholars in a range of fields. The text begins with a biographical essay by David Bromwich and an interpretative essay by George Kateb. Then Jean Bethke Elshtain, Owen Fiss, Judge Richard A. Posner and Jeremy Waldron present commentaries on the pertinence of Mill's thinking to early 21st century debates. They discuss, for example, the uses of authority and tradition, the shifting legal boundaries of free speech and free action, the relation of personal liberty to market individualism, and the tension between the right to live as one pleases and the right to criticize anyone's way of life.