Langefors was born in Ystad, Sweden, in 1915, and received his training from the Royal Institute of Technology, Stockholm. He started his career in Nordic Armature Factories (NAF) industries, and in 1949 he got recruited for the SAAB aircraft company. In 1965 he went to Stockholm and was stationed at the University at the Department of Mathematical Statistics. From 1967 to 1980 he was Professor of Business Information Systems at the Department of Computer and Systems Science, Stockholm (...)