Willem E. Saris is Professor at Escuela Superior de Administración y Dirección de Empresas (ESADE) in Barcelona, Spain. He was Laureate of the 2005 Descartes Prize for Best Collaborative Research and has over thirty years of teaching experience in the field of survey methodology.

Irmtraud N. Gallhofer is Senior Researcher of projects for the European Social Survey (ESS) at ESADE in Barcelona, Spain. The recipient of the 2005 Descartes Prize for Best Collaborative Research, she has extensive teaching and research experience in text analysis and has been an invited lecturer at numerous universities.