In this comprehensive study of the modern American public intellectual - that individual who speaks to the public on issues of political or ideological moment - Richard Posner charts the decline of a venerable institution that included worthies from Socrates to John Dewey. With the rapid growth of the media in recent years, highly visible forums for discussion have multiplied, while greater academic specialization has yielded a growing number of narrowly trained scholars. Posner tracks these two trends to their inevitable intersection: a proliferation of modern academics commenting on topics outside their ken. The resulting scene - one of off-the-cuff pronouncements, erroneous predictions, and ignorant policy proposals - compares poorly with the performance of earlier public intellectuals, largely nonacademics whose erudition and breadth of knowledge were well suited to public discourse. Leveling a balanced attack on liberal and conservative pundits alike, Posner describes the styles and genres, constraints and incentives, of the activity of public intellectuals. He identifies a market for this activity - one with recognizable patterns and conventions but an absence of quality controls. He also offers modest proposals for improving the performance of this market - and the quality of public discussion in America today.

理查德·A. 波斯纳（Richard A. Posner, 1939- ），先后以第一名毕业于耶鲁大学文学系（1959）和哈佛法学院（1962）。曾任美国联邦最高法院大法官助手、政府律师。联邦司法部副部长助理，总统交通政策特别工作组首席法律顾问等职。后任斯坦福大学和芝加哥大学法学院教授和L.B. 弗雷曼讲座法学教授，联邦上诉法院法官，并担任芝加哥大学法学院法律经济学高级讲座主持人。1981年出任联邦第七巡回区上诉讼院至今（1993-2000年任首席法官），同时担任芝加哥大学法学院高级讲师。

“他是著述最丰的联邦法官，前无古人。任职上诉法院、仍属最高产的法学家之列，同样前无古人。如果以引证率测度影响力，那么当仁不让，波斯纳是世界的最有影响的法学家”（莱西格语）。