Delay differential equations (DDEs) are important in many areas of engineering and science. The aim of this book is to bring together contributions from leading experts on the theory and applications of functional and DDEs. The editors have strived throughout to point out the interdisciplinary nature of these contributions. For example, advances in stability analysis, computational techniques (symbolic and numerical), and results from many otherwise disconnected fields (automotive engineering, manufacturing, neuroscience, and control theory) have been included in this book. The different contributions are not intended as a comprehensive survey of the many areas in which functional and DDEs have been useful, but rather, they are meant to help a reader bridge the gap between theoretical work and applications and extend the results and methods to other fields.