Edwin Mansfield was a research pioneer into the economics of R& D and technological change. As appreciation and remembrance for his scholarly contributions, eminent scholars have contributed original papers for this edited volume. The authors have followed the Mansfieldian approach of emphasizing economic insight and intuition over mathematical rigor and as a result are very accessible. Essays in Honor of Edwin Mansfield has the potential to serve as a reader in all advanced undergraduate and graduate classes/seminars in the economics of R& D and technological change. This edited volume will be a definitive work in the field.