60 : Tetra Tech Inc.
|Top 100 Revenue:
|2009 earnings :
|Number of employees:
||Dan L. Batrack, chairman, president and CEO
|Lines of business:
||Environmental consulting services, technical support services, engineering and architecture services and remediation and construction management
||Defense Department, Navy, Army, National Science Foundation, Federal Aviation Administration and U.S. Agency for International Development
||Tetra Tech is working on a $51 million contract to provide information technology support services to the National Science Foundation. Tetra Tech has provided information technology support, proprietary applications development and other data management services to the NSF since 2003.