Janis B. Salin, Senior Vice President, General Counsel and Secretary of Tetra Tech, Inc. retired effective January 22, 2018. In connection with Ms. Salin's retirement, effective January 22, 2018, Preston Hopson was appointed by the Board of Directors as Senior Vice President, General Counsel and Secretary of the company.
Tetra Tech, Inc. is a global provider of consulting and engineering services that is focused on water, environment, sustainable infrastructure, renewable energy and international development. The Company is Leading with Science to provide solutions for its public and private clients. The Company operates through its two segments: government services group (GSG) and commercial/international services group (CIG). Its GSG segment provides consulting and engineering services primarily to United States (U.S.) government clients and development agencies worldwide. The Company's CIG segment primarily provides consulting and engineering services to U.S. commercial clients and international clients that include both commercial and government sectors. Its CIG segment provides sustainable infrastructure and related environmental, engineering and project management services to commercial and local government clients across Canada, in Asia Pacific, the United Kingdom, as well as Brazil and Chile.
TETRA TECH, INC. 
