This volume of essays in honour of Daniel G. Freedman provides an overview of holistic studies of human behaviour. Freedman's pioneering ethological analyses encouraged naturalistic studies of evolved bases of behaviour. His comparative view of behaviour helped prepare the way for much of the current cross-cultural research. The scholars in the volume acknowledge Freedman's influence on work in areas such as human behavioural genetics, developmental psycho-biology, cross-cultural observational research, and evolutionary psychology. Uniting the chapters is the conviction that psychology benefits from the infusion of biological concepts and methods.