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Know More. Do More. And Profit More with Deltek. Headquartered in Herndon, Virginia, with over 1,600 employees worldwide, Deltek is the leading global provider of enterprise software and information solutions for professional services firms, government contractors, and government agencies. For decades, we have delivered actionable insight that empowers our customers to unlock their business potential. Our marquee list of customers includes: 98% of the Top 100 Federal Contractors 100% of the Engineering News Record Top 10 Design Firms 80% of the Engineering News Record Top 500 Design Firms Approximately 80% of the 2009 ZweigWhite Top 200 fastest-growing Architecture, Engineering and Environmental consulting firms Four of the five largest Global Accounting and Consulting firms The world's three largest Marketing Communications Networks