Hella Hernberg is a postdoctoral researcher at the Department of Design, Aalto University. Her research investigates the mediation of sustainable change processes involving multi-actor networks in spatial and material contexts. She holds a Doctor of Arts degree from 2022. Her doctoral thesis, titled Architects as ‘Mediators’ – Socio-political roles in mediating the ‘temporary use’ of vacant spaces, investigated the roles of mediators in the temporary use of vacant spaces, seen more broadly as part of urban sustainability transitions. Her doctoral research was partly based on professional architectural work on similar themes since 2008. Since 2010, she has run her own company, Urban Dream Management, and in 2012-13 she worked as a strategic designer at the Ministry of the Environment.