About Us

We believe in offering the services our clients need throughout the life of their land development projects by providing civil / site engineering, land surveying, geotechnical engineering, due diligence, environmental services, CMT, and GIS services.

TERRA is unique among engineering firms in that it is owned by its employees. Because it is employee-owned, everyone at TERRA has an investment in doing the best job possible for our clients and ensuring they are happy with the products and services we provide.



Mark Behrenslarge_122aa9197_informal_mark01

President, Director of Geotechnical Engineering

As a company founder and the Director of Geotechnical Engineering, Mark has more than 23 years of experience in both the private and public sector. He oversees many aspects of TERRA’s services and shares responsibilities for business development, strategic partnerships, back office operations, and community outreach.

Mark’s international and local experience in both the private and public sector gives him a unique and valuable perspective of civil, geotechnical, and environmental engineering as well as surveying and construction materials testing and inspection consulting services. Early in his career and during his tenure with a large international engineering consulting firm he was made a construction site engineer managing a wide range of rural development construction projects in Africa. One of these projects involved a large plant hire road construction project which entailed managing and building several roads for a total of approximately 24 km of new road construction and included several stream culvert structures in a very rural part of Africa on the Mozambique border. This experience was invaluable as it allowed him to experience engineering design, surveying, construction materials testing and managing construction projects in the field.

Mark made his dream of owning his own engineering consulting firm a reality when he co-founded TERRA in 2008. He is dedicated to the organization and believes in providing a flexible environment with a family first mentality. Mark strives to provide the kind of service that he would want to receive as a client and is building a long-term company legacy.


Brian Slake

Survey Crew Chief, Construction Inspector

Brian has more than 18 years of experience in providing construction inspection, material testing and survey field services. His unique combination of construction inspection and land surveying experience allow him and his crew to deliver a more comprehensive, cost-sensitive product for TERRA’s clients.

Brian’s inspection experience covers nearly all areas of material testing used within construction including field and lab testing of soils, concrete and asphalt, structural inspections including wood and steel framing and reinforcing steel, infrastructure inspections including sanitary, storm and water. He is a certified INDOT technician in the state of Indiana.

Brian’s expertise in land surveying includes control setup, field data collection, and construction staking.