Luc Trouche is professor emeritus of the French Institute of Education, at the École normale supérieure de Lyon (France) He first became interested in the integration of digital technologies in the teaching of mathematics. In particular, he studied the interactions between the instrumentation process and the conceptualization processes. This study led him to analyze the role of the professor, introducing the notion of instrumental orchestration to model the management, by the professor, of the artefacts available in the environment to implement a given mathematical situation. Since then, he has been interested in the teacher's role as designer, in relation to the development of his knowledge, in a moment of proliferation of digital resources. This perspective led to the emergence of the documentational approach to didactics. Analyzing the interactions of teachers with resources naturally leads to an interest in their collective work. Indeed, the digitalization of communication and information leads to the emergence of more or less formal work collectives: networks, associations, communities, inside or outside schools. Studying the interactions between individual and collective resource systems provides means for rethinking how to support the professional development of actors in a moment of metamorphosis of learning and teaching environments. These reflection gave rise to a book, published in 2019: The 'Resource' Approach to Mathematics Education.