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Juan-Carlos Moreno is Professor of General Linguistics at the Universidad Autónoma de Madrid (Spain). He has also taken part as a scientific advisor in the World Languages Review project hosted by the UNESCO-Etxea (Basque Country). He has published 20 books on linguistics in Spanish and more than one hundred papers in Spanish and English.

José-Luis Mendívil-Giró is Professor of General Linguistics at the University of Zaragoza. His research has focused on the theory of grammar and the nature and extent of linguistic change and diversity. He was the main researcher of the project Typology and internal variation of the case & agreement systems in the world’s languages (Spanish Government). He is the author of Origen, evolución y diversidad de las lenguas (Peter Lang, 2009), and the editor (together with C. Boeckx and M. Horno) of Language, from a Biological Point of View (Cambridge Scholars, 2012).