A guru, by deﬁnition, is a good person, a wise person and a teacher. A quality guru should be all of these, plus have a concept and approach to quality within business that has made a major and lasting impact. The gurus mentioned in this section have done, and continue to do, that, in some cases, even after their death. There are many other quality "gurus" whose philosophies and ideas ﬁll whole books on their own. The ones included in this section are those whose reputation is primarily for their work in quality and excellence.