This introduction to the “Festschrift for Willibald Ruch” outlines his impressive achievements in humor research, especially in the areas of measurement, individual differences as well as models and theories. Though mostly focusing on the psychology of humor and the sense of humor, Willibald also pioneered interdisciplinary and cross-cultural humor studies. This Festschrift comprises seven invited commentaries and eight articles, which expand areas of research that Willibald significantly shaped and advanced, including humor appreciation, comprehension and production, cheerfulness, dispositions towards laughter and being laughed at, as well as comic styles and humor dimensions.