6. Computer Sciences Corp. (CSC)
Fifty-year-old CSC provides technology services through its 92,00 employees to customers in health care, public sector, financial services and manufacturing. President and CEO Mike Laphen has led CSC as president since 2003 and was elected CEO in 2007. He joined the company in 1977 and has held a number of senior positions involving technical, financial and general management experiences in diverse commercial, public-sector and international markets.