He received his MSc degree in engineering physics and the PhD degree from Uppsala University in 1980 and 1983 respectively He has been with the faculty of EE of KTH, Royal Institute of Technology in Stockholm, Sweden since 1984 where he holds a position as professor in solid state electronics. Since 2001 he is head of the department of microelectronics and information technology. Since December 2004 he is appointed Dean, School of Information and Communication Technology, KTH.

He was a senior visiting Fulbright Scholar 1993-94 with the center for integrated systems at Stanford University, and a visiting professor with the University of Florida, Gaines ville. He initiated and was appointed program director by the Swedish Foundation for Strategic Research for a silicon nanoelectronics national program 2000-2007. From 2006 he is a member of the ENIAC SCC Management Team in the EU. In 2005 he co-founded the company TranSiC. He has been frequently engaged as expert reviewer for the framework programs in EU and for the European Research Council.

His research interests are silicon/silicon germanium de vices and process technology for very high frequency, as well as de vice technology for wide bandgap semiconductors with special emphasis on silicon carbide and nitride based structures. He has super vised 20 PhD theses work, and been the author of 1 text book, 8 book chapters and about 350 scientific papers published in international journals and conferences. He is an editor of the IEEE Electron Device Letters and a fellow of the IEEE.