Matt Clark leads GSS with a hands-on approach, overseeing company strategy and direction. With deep experience in planning, permitting, and remedial development, he ensures that every project meets the highest standards of quality, safety, and compliance. Under his leadership, GSS has successfully navigated thousands of environmental challenges, from major national disasters like the Deepwater Horizon spill to the specialized and varied needs of regional clients.

Outside of his professional responsibilities, Matt and his wife, Sandy, are dedicated to local public service and New England sports.

Tom Clark provides strategic oversight for GSS’s regional operations, field staff, and asset management. With over 30 years of experience, he specializes in commercial site rehabilitation and has spent two decades directing the installation and remediation of complex fuel depot systems across New England.

From sophisticated groundwater treatment to large-scale spill responses, Tom ensures every project is executed with technical precision and regulatory integrity. He has cultivated a professional field team known for being discerning and unyielding in their commitment to safety.

When he does get away from his desk, Tom is an active traveler who enjoys mountain biking and snorkeling with his wife.

Shelley Tamis brings over 25 years of project management experience to GSS, serving as a critical anchor for the team. As a central resource for the organization, she mentors and manages the project management team, ensuring they have the technical support and training needed to navigate complex site challenges.

Shelley is known for “keeping the wheels turning” across GSS’s diverse service lines, from streamlining workflows to personally managing large-scale projects. Beyond operations, she is a driver of company growth, focusing on sales development and the consistent achievement of annual and monthly targets. Her deep industry knowledge and connections ensure the team remains proficient, organized, and focused on delivering the highest standards of client satisfaction.

Mr. LaMothe brings over 30 years of industry knowledge and experience in the environmental field managing emergency response, assessment, remediation, operation and maintenance, consulting, decontamination, decommissioning, and construction projects with the ability to balance innovativeness and cost efficiency. His knowledge and experience ranges from estimating and procurement, through project close-out and regulatory compliance, throughout New England. As a Licensed Site Professional (LSP), Mr. LaMothe has successfully managed and obtained regulatory closure for 100’s of Disposal Sites in Massachusetts alone.

Mr. Pascale has nearly 30 years of experience managing and supervising multi-disciplinary personnel (i.e., supervisors, equipment operators, foremen, sample technicians, cleanup technicians, equipment fabricators, carpenters, and subcontractors) within the petroleum industry. His specialties include fuel system construction, remodeling, and decommissioning, including fire alarm systems, drainage, overhead canopies, underground and overhead communication, pump stations, and concrete work. Pascale primary responsibilities include but are not limited to scheduling project resources; determining the budget, scope, and objectives for proposed projects; communicating between the client and State, Local, and Federal entities to ensure project coordination; enforcing proper safety compliance; and conducting field employee evaluations.

Ms. Strachan is an experienced project manager versed in subsurface remediation, spill cleanup and prevention, and hazardous waste transportation and disposal. She brings over 20 years of remedial knowledge and experience working with both public and private sector clients. In addition to her project management experience, Ms. Strachan brings a range of civic knowledge from her time at the New Hampshire Department of Environmental Services (NHDES), where she managed the DERA State Clean Diesel Program and reported directly to the State Government Energy Commission (SGEC) to achieve the State’s energy reduction goals. As a senior project manager at GSS, Ms. Strachan manages a variety of remedial and industrial projects throughout NH and MA.

Mr. Carleton has over 13 years of experience in the environmental construction industry. His background as a foreman, equipment operator, and field technician in the field brings hands-on knowledge to his position as a project manager. Kyle has numerous years of experience in complex remediation situations including soil remediation, high hazardous emergency response, and marine.

With a career spanning more than three decades, Jon Bowden has seen the environmental services industry from every angle. Starting as a field chemist in 1991, Jon developed a philosophy that defines his work today: treat every project as unique and remain open to new tactics.

At GSS, Jon specializes in transportation and disposal, helping to scale our operations while maintaining the high-touch service our clients expect. He is an expert at de-engineering overly complex projects to ensure successful, cost-effective outcomes. When he isn’t managing waste streams, Jon enjoys hiking and harvesting apples for craft cider on his small farm.