Stefan Klein, PhD, is one of Europe's premier science writers, as well as himself a trained physicist. He is the author of numerous books, including the #1 international bestseller The Science of Happiness. His books have been translated into twenty-five languages, and he is the recipient of the prestigious Georg von Holtzbrink Prize for Scientific Journalism. David Dollenmayer is a literary translator and emeritus professor of German at the Worcester Polytechnic Institute in Worcester, Massachusetts. Winner of the 2008 Helen and Kurt Wolff Translator's Prize and the 2010 Translation Prize of the Austrian Cultural Forum in New York, he lives in Hopkinton, Massachusetts.