A long established research crystallographer, John Helliwell, provides his perspectives on crystallography, one of the most multidisciplinary sciences, having its roots in fields as varied as mathematics, physics, chemistry, biology, materials science, computation and planetary earth sciences among many others. The UNESCO approved International Year of Crystallography took place in 2014. A key message was to build on the achievements of that year. This book aims to contribute to that process by providing rich and colorful information on everything from the history of crystal structure analysis to the societal impacts of crystallography in the sustainability of life.