Kjell Stordahl obtained his MSc from the University of Oslo in 1972. He worked at the Research Department of Telenor for 15 years – seven years as manager of the teletraffic field. He was Chief Planning Manager in Telenor Networks from 1989 until 1996 and Manager of Market Analysis 1997–2002. Kjell Stordahl was appointed associated reporter and special reporter 1981–1988 in CCITT SGII for “Forecasting International Traffic”. From 1985 to 1988 he participated in CCITT GAS 10 and developed a forecasting handbook. He has also worked for ITU’s headquarters as a specialist on forecasting. From 1994 to 1997 he was on the Board of Telenor Consult AS. He was referee for Project Imagine 21 in the ESPRIT Programme 1999–2001. Kjell Stordahl was on the Technical Advisory Board of Virtual Photonics 2000–2002, and since 1992 he has participated in various projects funded by the European Commission: RACE/TITAN, ACTS/OPTIMUM and TERA, IST/TONIC and CELTIC/ECOSYS. He has published over 150 papers in international journals and conferences.