This exhibition considers the transnational life and legacy of the activist and cofounder of the West German Green Party, Petra Kelly. The exhibition shows how Kelly’s transatlantic childhood and education enabled her to become a transnational activist. It follows the connections to friends, companions, and fellow activists all over the globe that shaped her approach to green politics and underpinned her contributions to the peace movement. Examining how the German and international press reported on Kelly, the exhibition reflects on how her profile as a Green celebrity was shaped. An analysis of the spiritual dimensions of Kelly’s green politics demonstrates how “deep green” frameworks helped the activist to think beyond the boundaries of “politics as usual.” Finally, the exhibition looks at Kelly’s legacy, considering how her ideas and her career have resonated differently in different parts of the world.