20. T-Systems North America
2009 Revenue: $6.8 billion
T-Systems CEO Reinhard Clemens began his career at IBM and later was president of EDS in Germany. T-Systems, a subsidiary of Deutsche Telecom, has roughly 25,000 employees; approximately 15,000 are involved in systems integration.
The integrator recently said it would partner with energy and automation technology specialist ABB to develop smart grid solutions in Germany.