Gall Zeidler Consultants LLC (GZ) is a worldwide leader in geotechnics, tunnel engineering and tunnel construction management, with special expertise in transportation and infrastructure projects. GZ has been involved in many national and international projects, ranging from highway tunnel construction to transit tunnel projects. The company specializes in mastering difficult ground conditions by utilizing various methods, including dewatering, grouting and ground freezing. It also specializes in tunneling under shallow overburden and protection of neighboring structures by innovatively combining conventional and mechanical tunneling methods with ground improvement and state of the art waterproofing techniques. GZ has seven office locations worldwide and is present in all major global markets including North America, South America, Europe and Asia. Gall Zeidler Consultants is headquartered in Virginia, US, and has a regional office in Santiago, Chile.