Birgit Anette Olsen is professor of Indo-European Linguistics at the Department of Nordic Studies and Linguistics at the University of Copenhagen, and previously leader of the five-year University of Copenhagen excellence programme Roots of Europe (20082013). She has published in particular about the Classical Armenian language and nominal word formation in Indo-European languages. Michael Peyrot is post-doc researcher at the University of Vienna on Tocharian and Indo-European linguistics. Georges-Jean Pinault is professor of linguistics at the Ecole pratique des hautes etudes, Paris. Thomas Olander is associate professor, dr.phil. at the Department of Nordic Studies and Linguistics, University of Copenhagen. He is editor at the journals Tocharian and Indo-European Studies and Copenhagen Studies of Indo-European both published at the Museum Tusculanum Press.