Meet Our Team


William Hess

Principal and Founder

William Hess is the visionary founder of Hess Engineering and Construction Consultants, which was established in 2020. With nearly two decades of industry experience, Will brings a wealth of knowledge and expertise to the firm.

Before starting Hess Engineering and Construction Consultants, Will worked as the town engineer for a large Boston suburb and served as an engineer and general manager for two different site contractors, respectively. He received his Professional Engineering (PE) license in 2019 and graduated from Wentworth Institute of Technology in 2008 with a degree in civil engineering.

Will comes from a long line of entrepreneurs and credits his mother and grandfather for inspiring his drive to start his own company. When not working, he enjoys spending time with his wife, Jill, and their two sons, Henry and Liam. The family loves swimming and boating on Squam Lake.

An active member of the American Society of Civil Engineers and New Hampshire Good Roads, Will is dedicated to advancing his field and contributing to his community.

6660709a9f4b2_Danni For Website

Danielle Seufert

Office Manager/Project Coordinator

Danni is a seasoned professional with a passion for project coordination and management. With three years of prior experience as a project coordinator, she honed her skills in organizing, planning, and coordinating various construction projects. Her hands-on experience, coupled with her managerial expertise, has provided her with a holistic understanding of project dynamics and client needs. Joining Hess Engineering and Construction Consultants marked a significant milestone in Danni's career journey. In her current role as Project Coordinator and Office Manager, she blends her organizational skills with her leadership abilities. Danni's dedication to excellence ensures that projects are executed efficiently, deadlines are met, and clients' expectations are exceeded. When Danni is not working, she enjoys time with her family, boating, fishing on the ocean, and traveling.


Jim Sumner

Storm Water Management Specialist

Jim Sumner is an EPA-certified CGP Inspector and heads our Stormwater Pollution Prevention Plan inspection teams. Jim brings extensive engineering experience and maturity to this sector of Hess Engineering and Construction Consultants. He holds a BS in Metallurgical Engineering from the University of Wisconsin–Madison and significant Nuclear Engineering and Quality Engineering practices from his 20 years as a Naval Officer in the US Navy submarine program and his long tenure in consumer product firms throughout the country. 

He is also well-versed in dealing with various regulatory agencies. In his spare time, Jim enjoys road bicycling, reading, and golf.


Ian Desmarais

Project Engineer

Ian Desmarais graduated from UNH with a BS in Civil Engineering. Ian’s prior engineering experience stems from conducting research on various topics at the University of Melbourne, AU, University of Sydney, AU, and the University of New Hampshire. While most of his research focused on fluid mechanics and climate change/resiliency, he has done work in material science, geotechnical engineering, and integrating social sciences into engineering environments. He was the president of UNH’s Engineering Honor Society, Tau Beta Pi, and achieved the rank of Eagle Scout.

Ian spends his free time reading, playing games, drawing, and working on his fish tanks.