David Gergen served as a White House advisor to four presidents and now lectures on public service at Harvard University in Massachusetts.

VOA: standard.2009.08.17

Aristotle famously was a tutor of Alexander the Great. Machiavelli spent a large part of his career in the foreign service of his native Florence and wrote as an advisor to the Medici.

亚里士多德有指导亚历山大大帝的著名史实；,马奇亚维利职涯中,长期服务于佛罗伦萨,原乡的外交部门,而且是梅迪西家族的顾问；

耶鲁公开课 - 政治哲学导论课程节选

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From 1993 to 1995 he served as the Senior Policy Advisor for national service in the Clinton Administration, where he helped lead the effort to establish the Corporation for National Service and its signature program, AmeriCorps.

WHITEHOUSE: The White House

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