Richard Lemmon

Tetra Tech UK Consulting Group Ltd. engages in the provision of project management and technical consultancy services. It operates through the Consultancy Services and International Development segments. The Consultancy Services segment includes Infrastructure and Built Environment, Programme and Project Management, Surveying and Asset Management, Environmental, and Planning and Transport. The International Development segment involves in building state of the art public transport systems and improved traffic management in developing cities. The company was founded on December 6, 1984 and is headquartered in Leeds, the United Kingdom.

GeoTrans, Inc. provides environmental engineering and remediation services. It serves the automotive, aerospace, manufacturing, energy, petrochemical, transportation, and telecommunication industries. The company was founded in 1979 and is located in Sterling, VA.

Tetra Tech NUS, Inc. provides environmental, engineering, remediation and information technology consulting services. The company is headquartered in Pittsburgh. PA.

Tetra Tech Tesoro, Inc. provides construction services. It also build schools, hospitals, and clinics for selected commercial and private clients. The company was founded on June 4, 1997 and is headquartered in Virginia Beach, VA.

INDUS Enterprise Solutions, Inc. provides information technology support services. Its services include software development, database design, system administration and maintenance, systems integration, software and network engineering, web services-enabled solutions, and information systems security. The company was founded by Aaron B. Floyd in 1986 and is headquartered in Vienna, VA

Part of Tetra Tech, Inc., Coffey International Development Ltd. provides development consultancy services. The private company is based in Reading, UK. Coffey International Development was acquired by Tetra Tech Coffey Pty Ltd., part of Tetra Tech, Inc. from March 09, 2016 on March 06, 2006 for $6.13 million.

ARD, Inc. operates as an international development services consulting firm. The firm provides water resources and infrastructure, agriculture and economic growth, environment and natural resources, land tenure and property rights, democracy, governance and knowledge management services to international development customers. The company was founded by George C. Burrill and James R. Nolfi in 1977 and is headquartered in Burlington, VT.

Tetra Tech India Ltd. engages in the provision of consulting, engineering, program management, and construction management services. The company was founded on April 4, 2017 and is headquartered in New Delhi, India.