Willem F.H. Adelaar , Ph.D. (1977), University of Amsterdam, Emeritus Professor of Indigenous American Languages and Cultures at Leiden University. His research focuses on the languages of the Andes and the Amazon, with particular expertise in Quechuan and other Andean language families. He is the author of numerous monographs and scholarly articles, including Tarma Quechua (The Peter de Ridder Press, 1977) and The Languages of the Andes (with P. C.

Muysken, Cambridge University Press, 2004). In addition to his Andean work, he has published extensively on Amazonian languages and broader issues in South American linguistics. Hélène B. Brijnen , Ph.D. (2001), University of Amsterdam, is a retired lecturer in Slavic languages at the University of Groningen. Her research focuses on West Slavic linguistics, with particular expertise in Sorbian. She is the author of the monograph Die Sprache des Hanso Nepila (Domowina-Verlag, 2004) and has published a range of scholarly articles on West Slavic languages.

In addition, her work and publications extend beyond Europe to include research on Amazonian languages and broader issues in language documentation and description.