 He received the degree of licentiat from Stockholm University in 1949, before taking a break from his studies to work at the Swedish Board of Computer Machinery (Matematikmaskinnämnden), working on (among other things) the early computer BESK, Sweden's first.During this time, he also worked with Carl-Gustaf Rossby on early numerical weather forecasts.Dahlquist returned to Stockholm University to complete his Ph.D., "Stability and Error Bounds in the Numerical Solution of Ordinary Differential Equations", which he defended in 1958, with Fritz Carlson and Lars Hörmander as his advisors.