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