Sadao Adachi is Professor in the Graduate School of Engineering at Gunma University (Japan). Professor Adachi received his PhD at Osaka University (Japan) in 1980. He has written a number of successful books including "Properties of Group-IV, III-V and II-VI Semiconductors" in the Wiley Series in Materials for Electronic and Optoelectronic Applications and "Handbook on Physical Properties of Semiconductors". His research interests include the optical properties and microelectronics of group-IV semiconductors, III-V and II-VI semiconducting compounds.