Etienne Wenger-Trayner is a globally recognized thought leader in the field of social learning theory, including communities of practice and their application. He has authored and co-authored seminal articles and books on the topic: Situated Learning, where the term “community of practice” was coined; Communities of Practice: learning, meaning, and identity, where he lays out a theory of learning based on the concept; Cultivating Communities of Practice: a guide to managing knowledge, addressed to practitioners in organizations; Digital Habitats, which tackles challenges of using technology. His more recent books are coauthored with Beverly Wenger-Trayner. Learning in Landscapes of Practice expands the learning theory beyond single communities. Learning to make a difference: value creation in social learning spaces lays a new foundation for the theory, along with a framework for supporting and assessing social learning. Systems Convening sheds light on a crucial form of cross-boundary social learning leadership. The Communities of Practice Guidebook provides guidance for cultivating communities in and across organizations. This work is influencing both theory and practice in a wide range of disciplines. It increasingly provides a foundation to social-learning approaches for organizations in the private and public sectors. It is also influential in the academic sphere. One of the most cited authors in the social sciences, Etienne regularly speaks at conferences and seminars. He received honorary doctorates from the University of Brighton and the British Open University. To further develop social-learning theory, practice, and leadership, Etienne and Beverly recently founded the Social Learning Lab in Sesimbra, Portugal.