From founder of conceptual art and disseminator of left-radical literature to specialist in historical textiles, Seth Siegelaub's unbridled energy and curiosity, both literally and figuratively, is not only illustrative of the open-mindedness of art practice but also encourages reflection and research. In 31 encounters with artists and other experts – writers, designers, administrators, and thinkers – editors Lucas Hoeben and Eva Pel introduce Siegelaub’s history as a legacy. This publication can be seen as the starting point of the “Speaking Of__” project, where Hoeben and Pel use exceptional perspectives and other practices to translate Siegelaub’s legacy into contemporary art.