Maj Sjowall and Per Wahloo, both left-wing journalists and politically radical, met in 1961 while working for magazines published by the same company. They married the next year and together created the Martin Beck crime series, famously writing alternate chapters at night after putting their children to bed. Wahloo died at the age of 49 just as their 10th book was going to press. Sjowall currently lives in Sweden and continues to work as a writer and translator.

Per Wahlöö was born in Göteborg. After graduating from the University of Lund in 1946, he worked as a journalist, covering criminal and social issues for a number of newspapers and magazines. In the 1950s Wahlöö was engaged in radical political causes, activities that resulted in his deportation from Franco's Spain in 1957. After returning to Sweden, he wrote a number of television and radio plays, and was managing editor of several magazines, before becoming a full-time writer.