Joseph F. Eska is Professor of Language Sciences in the Department of English at Virginia Polytechnic Institute & State University, USA. Silva Nurmio is an Academy Research Fellow in the Department of Languages at the University of Helsinki, Finland. Peadar Ó Muircheartaigh is Senior Lecturer in the Department of Celtic and Scottish Studies at the University of Edinburgh, UK. Paul Russell is the Margaret Brooks Robinson Professor of Celtic Languages and Literatures in the Department of Celtic Languages and Literatures at Harvard University, USA.