This book honors the work of Ruut Veenhoven, who has been a pioneer and leader in the field of happiness studies for the past 50 years. It brings together experts in the field discussing Veenhoven’s work as well as taking up themes from his workshops over the years to analyze how and where the field has expanded following his research. Veenhoven’s contributions include developing theories and measuring instruments, creating the world’s first and largest database of happiness research, founding the world’s first and most frequently cited Journal of Happiness Studies, and student development in and popularization of the field of happiness studies. He has extensive publications through the International Sociological Association and the International Society for Quality of Life Studies, and the research field of happiness studies would not have become as broad today without his enormous contributions. Friends and former students of Veenhoven provide both academic and anecdotal discussions in this festschrift, which is important for anyone interested in the development of happiness research.