Lon Luvois Fuller was a noted legal philosopher

Philosophy

Philosophy is the study of general and fundamental problems, such as those connected with existence, knowledge, values, reason, mind, and language. Philosophy is distinguished from other ways of addressing such problems by its critical, generally systematic approach and its reliance on rational...

, who wrote The Morality of Law in 1964, discussing the connection between law and morality. Fuller was professor of Law at Harvard University

Harvard University

Harvard University is a private Ivy League university located in Cambridge, Massachusetts, United States, established in 1636 by the Massachusetts legislature. Harvard is the oldest institution of higher learning in the United States and the first corporation chartered in the country...

 for many years, and is noted in American law for his contributions to the law of contracts. His debate

Hart-Fuller debate

The Hart-Fuller debate is an exchange between Lon Fuller and H.L.A. Hart published in the Harvard Law Review in 1958 on morality and law, which demonstrated the divide between the positivist and natural law philosophy. Appearing in 1958 in the Harvard Law Review, Hart took the positivist view in...

 with H.L.A. Hart in the Harvard Law Review

Harvard Law Review

The Harvard Law Review is a journal of legal scholarship published by an independent student group at Harvard Law School.-Overview:According to the 2008 Journal Citation Reports, the Review is the most cited law review and has the second-highest impact factor in the category "law" after the...

 (Vol. 71) was of significant importance for framing the modern conflict between legal positivism and natural law.