Jan 18, 2018 -PASADENA, Calif.--(BUSINESS WIRE)-- Tetra Tech, Inc. (NASDAQ: TTEK) has announced that it has signed a definitive agreement to acquire Norman Disney & Young (NDY), a leader in sustainable infrastructure engineering design. Established in 1959, NDY maintains offices throughout Australia, the Asia-Pacific region, the United Kingdom, and Canada. NDY incorporates innovative technologies and solutions into designs, helping to create environments that use less energy, recycle water, and provide safe and sustainable infrastructure. “The addition of NDY to our sustainable infrastructure design practice will enable Tetra Tech to offer technically differentiated solutions to our commercial and government clients on…