Established in 1989, John D. Hynes & Associates Inc. is one of the largest consulting engineering firms in the United States. Based in Salisbury, Md., the company offers a range of geotechnical, environmental, construction inspection, and material testing services to both the public and private sector. It offers consulting services to a variety of projects, such as residential structures, schools and institutional projects, expansions to industrial plants and shoreline improvement systems. John D. Hynes & Associates Inc. is accredited by American Association of State Highway and Transportation Officials.

Landmark Engineering offers surveying, engineering, planning and design services in civil and site engineering. The firm will perform planning and site design services for public and private projects, which include schematic design, design development, construction documents and cost estimates, as well as assistance in obtaining approvals and permits. Engineering disciplines available include topographic surveys, site engineering, grading and drainage, hydraulic analyses and design, streets and entrances, sanitary and storm sewer utilities, erosion and sediment control plans, supporting structural design, preparation and submission of federal, state and local permit applications, other agency processings and construction phase services. Landmark Engineering is located in New Castle, Del.