We are a multi-faceted team of scientists & technicians.

We provide services in the fields of construction management, hydrology, survey, biology, environmental permitting, and historic assessment / preservation. Learn more about our executive team below. EIV is a quality DBE organization.


Jacqueline Dagesse, MBA, CPESC, PMP

President, Director of Environmental Services

Ms. Dagesse is a certified project management professional with degrees in both business and engineering. At EIV she has developed a performance management system and financial program that combines financial leadership with key business values to position EIV for long-term growth and profitability. Her expertise in the development and implementation of creative finance solutions facilitates enterprise-level strategies and business initiatives.

In her technical work, she has focused on environmental engineering projects which have included: hydraulic analysis, culvert design, erosion prevention and sediment control design and inspection, aquatic organism passage recommendations, fluvial geomorphology analysis, stormwater BMP design, and wastewater system design. She is a Certified Professional in Erosion and Sediment Control, and performs environmental compliance inspections on civil projects.


Nathan Dagesse

Vice President, Director of Development

Mr. Dagesse manages a team of 15 highly skilled construction engineering professionals. In this role, his team provides resident engineering services, detailed inspection, and on-site field testing of materials for State and Municipal bridge, rail and roadway projects. They have experience in recording field measurement data necessary to submit monthly and final estimates, project progress reports, and preparation of records for transportation construction projects throughout the state of Vermont.

Mr. Dagesse is detail-oriented and has an excellent reputation for his demanding standards for quality assurance. He has taken the lead for his team on complex bridge construction projects, emergency response construction, and contract claims analysis.


Jason Waysville, PE

Vice President, Director of Engineering

Mr. Waysville manages a group of design and support professionals for structural and civil engineering services.  He is a senior transportation engineer with over 10 years of experience as a senior engineer on various types of transportation and civil projects involving bridge, highway, railroad, roundabout, and private land development. On these projects he has performed structural inspection, construction management, and design. Mr. Waysville works closely with his clients to develop creative and effective solutions designed to meet both the complexity of the project and the needs of the community.


Sabin Clark, PE

Associate Director of Engineering

Mr. Clark has over 10 years of experience in the construction industry and specializes in civil engineering infrastructure associated with transportation projects.  He has filled lead roles in quality assurance functions, contract compliance, and other resident engineering duties.   He is a Professional Engineer in the State of Vermont, and is relied on by our clients for complex and challenging projects.

Mr. Clark is also a Captain in the Vermont Army National Guard, commanding nearly 200 soldiers in a part time capacity, showcasing his dedication to duty, leadership and management skills.


Mary O’Leary

Past President, Sales & Marketing

Ms. O’Leary has over 25 years of experience within the contracting industry and earned her Master’s degree from Cornell University in Soil and Water Engineering. She was the principal and sole manager of EIV Technical Services for over 15 years. In this capacity, she was responsible for strategic business planning, sales and contracting, and finance. She grew the organization significantly within the first 5 years of running the business and secured long-term State retainer contracts.

In her technical profession, Mary is a Senior Hydrogeologist and Environmental Permitting Manager. She takes the lead on complex Act 250 permitting, hydraulic analysis and fluvial geomorphology assignments. She also provides continuing education courses for professionals working within the water and soil science fields.


Russ Colvin

Associate Director of Development

Mr. Colvin is an engineer and professional construction manager. He has degrees in both Liberal Arts and in Civil Engineering from the University of Vermont and has worked in the construction industry in Vermont for over forty years. He worked as the construction administrator for a reputable local architectural firm for five years and for a regional engineering firm in their structural division for five years. Mr. Colvin is a CSI certified contract documents technician and holds certifications for testing and technical inspections for concrete, bituminous, aggregate, and pile driving.

During the period of time that Mr. Colvin was working to obtain a degree in Civil Engineering, he also worked full time to provide owners representative services and clerk of the works services for many municipal projects all over Vermont. Those projects included school construction projects, public works facilities, waste water treatment facilities, fish hatchery expansions, public safety buildings, historical renovations, and private and state office building projects.

Prior to engaging in the architectural/engineering professions, Mr. Colvin owned his own construction company, Architectural Woodworking Inc., specializing is custom homes and fine woodworking. His company specialized in post and beam construction and in fine woodworking.

Prior to owning his own business Mr. Colvin worked as a carpenter for twenty years. He worked as a construction superintendent for a large general contractor in North Conway, New Hampshire for a few years before returning to his home State of Vermont. He was respected for his fine woodworking skills and worked for many local developers located in Chittenden County to provide a variety of services including field engineering services, working as a construction superintendent, and most enjoyably, working as a finish carpentry to renovate and build restaurants, office buildings, commercial, and residential properties.