The Concept of Entrepreneurial Orientation reviews where Entrepreneurial Orientation (EO) scholarship has come so far, identifies interesting gaps for the future, and encourages extending the knowledge frontier in this area. The authors acknowledge key developmental milestones in EO studies, attempt to make sense of the extant EO literature, highlight possible avenues for further work, and offer specific suggestions for exploring areas where EO research has not gone before. This monograph shows that EO research has made considerable strides over its life course as well as point to productive directions for the EO concept going forward.