Northern Irish artist Sandra Johnston uses performance and installation to explore the aftermath of trauma through acts of commemoration as forms of testimony and empathetic encounter. Johnston is a co-founder of collectives including CATALYST ARTS and BBEYOND. She completed a PhD research project ‘Beyond Reasonable Doubt: An Investigation into Concepts of Doubt, Risk and Testimony Explored Through Consideration of Performance Art Processes in Relation to Systems of Legal Justice’ in 2013.