David Singleton is Professor, University of Pannonia, Hungary and Fellow Emeritus, Trinity College, Dublin, Ireland. He has published widely on second language acquisition, multilingualism and lexicology and is the series editor for the SLA series published by Multilingual Matters.Zsolt Lengyel is a professor at the University of Pannonia, Veszprém, a part time professor at the University of Pécs and a visiting professor at Zagreb University, Croatia. He took his MA in Hungarian, Russian philology and Applied linguistics at Debrecen University, Hungary. He received PhD in developmental psycholinguistics. He was given Brassai Sámuel Award in 2002. His research interests include language development of Hungarian children, development of literacy before schooling, bilingual education in the kindergarten, word associations of 10-14 year old children and students of 18-24 years of age. He has written numerous articles, books on the mentioned topics. He is editor, member of editorial boards of several applied linguistics journals both in Hungary and abroad.