In the mid nineties Saab concluded that they lacked the computational tools necessary to design the next generation stealth products. Neither were these tools available from commercial software vendors. This became the starting point for a large research project at KTH, all the time in close cooperation with end users at Saab and Ericsson. The project was named GEMS and the research group was lead by Prof. Björn Engquist.

Right from the start the project target was to find numerical methods capable of giving accurate solutions to electromagnetic problems in three dimensions for complex objects with an overall size many times bigger than the wave length, and implement these using algorithms suitable for parallel computers. This effort resulted in significant contributions to novel numerical techniques, for example the Multi Level Fast Multipole Method, and also in many publications and PhD degrees at KTH and Uppsala University.

In the summer of 2006 Efield AB was formed. We continue the development of the research code from the GEMS project and sell it under the trademark Efield®.