National engineering firms JGI EASTERN and Zipper Zeman Associates change names to Terracon

January 12, 2009 |

OLATHE, Kan. --- JGI EASTERN, Inc. (JGI) and Zipper Zeman Associates (ZZA) have officially changed their names to Terracon Consultants, Inc. after operating as wholly owned Terracon subsidiaries for two and three years respectively.

JGI is a multi-disciplinary consulting firm with headquarters in Manchester, N.H., and offices in

Hartford, Conn., and Portland, Maine.  JGI offers a comprehensive range of services in the fields of environmental and geotechnical engineering, hydrogeology, and construction materials engineering and testing.  The firm’s clients include real estate developers, architectural and engineering firms, retail owners, and public agencies. Larry Dwyer, P.E., continues his role managing Terracon’s Manchester office and Ryan Roy, P.E., will continue his role as manager of the Hartford and Portland, Maine, offices. 

ZZA is a leading provider of geotechnical, environmental and construction materials services in the Northwest, with office locations in Seattle, Bellevue and Tacoma, Wash.  ZZA was established in 1998 by a group of geotechnical engineers, geologists and environmental specialists with extensive Northwest and national consulting experience. The firm’s clients include real estate developers, architectural and engineering firms, and public sector clients such as municipal and county governments.  John Zipper, P.E., will continue in his current role managing Terracon’s Northwest division, which includes Seattle, Bellevue and Tacoma, in addition to existing Terracon offices in Portland, Ore., and Boise, Idaho.

Terracon is an employee-owned engineering consulting firm providing geotechnical, environmental, construction materials and facilities services from nearly 100 offices nationwide with more than 2,500 employees. Terracon currently ranks 41st on Engineering News-Record’s List of Top 500 Design Firms. For additional information about Terracon, please visit

Overlay Init