The journalist, writer and lecturer Käthe Schirmacher (1865-1930) is presented in this volume as an exemplary protagonist of the transition in European societies around 1900. The transnational agitator, who positioned herself as a 'modern woman' and lived in intimate relationships with women, addressed different political arenas as a radical women's rights activist and later ethnic politician. With its claim to authority and competence, it challenged the rules of access to hegemonic publics. In her extensive estate, she becomes visible as a narrator of her own life, who repeatedly redesigned herself autobiographically in changing constellations. With the innovative conception of a biography in co-production, the volume encourages the further methodological development of open biographical research processes.