Dr. Juan M. Fernández-Luna received his degree in Computer Science from the University of Granada, Spain, in 1994 and his Ph.D. degree from the University of Granada in 2001, working on a thesis in which several retrieval models based on Bayesian networks for information retrieval were designed. He is currently a professor in the Computer Science Department at the University of Granada. His main research interests include XML retrieval, working in collaboration with Juan F. Huete and Luis M. de Campos in XML personalization, collaborative IR, recommender systems, and learning to rank, areas in which they have published papers in prestigious journals and international conferences and edited special issues.