Hans-Werner Wahl, PhD, is Professor of Social and Environmental Gerontology and chair of the Department of Social and Environmental Gerontology at the German Centre for Research on Ageing at the University of Heidelberg, Germany. His current research interests cover conceptual and empirical issues of environmental gerontology, the psychosocial consequences of age-related vision loss, everyday competence of older adults, and intervention strategies. He has published 10 books and many journal articles and chapters.