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This paper provides an overview of the state of art of research on social entrepreneurship and the establishment of this topic in the academic world. It uses scientometric methods in measuring the maturity of social entrepreneurship research. The empirical part reveals the exponentially growing number of papers, the institutionalization of social entrepreneurship in seven dimensions, the emergence of thematic clusters, and methodological issues. The paper makes concrete suggestions on how to overcome methodological challenges. Furthermore, we provide a ranking of the 22 most cited academic contributions in social entrepreneurship. Surprisingly, almost half of the most cited papers have not been published in journals but in books, raising doubts about the current (over-)rating of journal publications.

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While the concept of entrepreneurial ecosystems is now a prominent topic and an important stream in entrepreneurship research, the question how ecosystems can specifically promote sustainable entrepreneurship and contribute to the Sustainable Development Goals (SDGs) set by the United Nations is a neglected issue. With the papers in this special issue, we address this research gap, serving as a catalyst sparking more research at the nexus of contextualization of entrepreneurship and sustainability. This research has, since the 1990s, developed in three waves; the explicit linkage to SDGs and the investigation of impacts of entrepreneurship and entrepreneurial ecosystems in achieving societal and environmental goals might be considered as the "fourth wave." We first introduce relevant research streams and concepts for investigating sustainable entrepreneurial ecosystems. Then, we explain why this special issue and its articles represent a fourth wave in entrepreneurial research ("sustainability"). Thereafter, we provide an overview of the papers of this special issue and then end with a brief consideration of future research demands.

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