He has worked as a cook and trained in catering management, and has researched into Roman food and diet for more than twenty years. His previous publications include Anthimus: On the Observance of Foods (1996), Dieting for an Emperor (1997) and Roman Cookery: Ancient Recipes for Modern Kitchens (1999).Galen is the author of 'Galen on Food and Diet' with ISBN 9780415232333 and ISBN 0415232333.