Alexandra Aikhenvald (PhD 1984, DLitt 2006), James Cook University, is Distinguished Professor and Australian Laureate Fellow. She published numerous articels and monographs on languages of Papua New Guinea and South America, and on perception and cognition, including Evidentiality (Oxford University Press, 2004) and Languages of the Amazon (Oxford University Press, 2012).Anne Storch (PhD 1999), University of Cologne, is Full Professor of African Languages and Linguistics at the University of Cologne. She published on various languages of West and East-Central Africa and on African speech registers, including Secret Manipulations (Oxford University Press, 2011). Her book on Repertoires and Choices in African Languages, co-authored by Friederike Lüpke, is in print. Contributors include Alexandra Y. Aikhenvald, Anne Storch; Christa König; Willem F.H. Adelaar, Lourens de Vries, Matthias Brenzinger, Anne Maria Fehn, Angelika Jakobi, El-Shafie El-Guzuuli, Gertrud Schneider-Blum, Gerrit J. Dimmendaal, and Marilena Thanassoula.