请将以下简介翻译成中文。


John Smith is an American author and professor of philosophy at Harvard University. He is best known for his works on existentialism and phenomenology. He has published numerous articles and books on these subjects, including the critically acclaimed "The Meaning of Life" and "Existentialism and Humanism".
John Smith是一位美国作家，也是哈佛大学哲学教授。他最为人所知的是他在存在主义和现象学方面的著作。他已经出版了很多关于这些主题的文章和书籍，其中包括备受好评的《生命的意义》和《存在主义与人道主义》。