What are the conditions under which a person’s will is free and they are responsible for what they do? As the essays in this volume demonstrate, this question cannot be answered exclusively from the armchair or exclusively with the empirical methods of science. Nadelhoffer and Munroe have assembled a set of exciting, transdisciplinary essays that seamlessly synthesize philosophical, theoretical, and empirical perspectives. Though experimental philosophy is a relatively young field, the sense that it has come of age and is delivering important new insights about human agency is evident throughout these pages.