Descriptions of sustainability entrepreneurs have involved various characteristics such as motivation, knowledge, orientation, cognition, and ways of organizing their ventures, yet none of these are by themselves distinguishing features of sustainability entrepreneurs. A key research task in driving forward research in this area is the development of operational definition that reflects the complex constellation of characteristics that collectively distinguish sustainability entrepreneurs. In tackling this task, this paper seeks to empirically identify sustainability entrepreneurs using criteria that go beyond an overall commitment to sustainability and involve a more complex set of conditions; and to organize the potential heterogeneity of sustainability entrepreneur into coherent typology.