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, Rebecca.

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.

Rick LaMothe brings over 30 years of environmental experience to GSS. As a Licensed Site Professional (LSP), he provides the technical and regulatory oversight needed to handle everything from emergency spill response and site assessments to industrial decontamination.

Rick is a pro at managing the communication required between stakeholders on projects of all sizes. Whether he is overseeing a complex decommissioning project or a residential heating oil cleanup, he knows how to find the right balance between smart technical solutions and smart budget decisions.

Outside of work, he keeps himself busy with a variety of hobbies, spending time outdoors and with his wife, friends and family.

Mark Pascale brings over 30 years of construction and environmental experience to GSS, with a deep background in land development, industrial contracting, and fueling system design. He is a hands-on leader specializing in the construction, remodeling, and decommissioning of complex fuel systems, overseeing everything from pump stations and concrete work to fire alarms and drainage.

Mark manages the full logistics of a job site, including resource scheduling, budgeting, and coordination between clients and government agencies. With a focus on safety and precision, he supervises multi-disciplinary teams to ensure every phase of a project is executed to GSS standards. An expert in high-stakes environments, he is NIMS Incident Commander and OSHA HAZWOPER trained, holding specialized certifications in confined space entry, rescue, and railroad emergency operations.

Liz Strachan brings over 25 years of environmental experience to the GSS team, specializing in a broad range of environmental challenges. With a background that spans both the public and private sectors, she provides a deep understanding of the regulatory landscape for every project she oversees.

At GSS, Liz manages complex remedial and industrial projects throughout New England. She is the manager of our water treatment operations, having overseen the initial setup of our treatment facility and now managing its day-to-day operations. Liz is known for her ability to handle large-scale field challenges—from large soil removals to intricate industrial cleanups—while balancing smart technical solutions with project efficiency.

Outside of the office, Liz is a talented florist who cultivates and sells beautiful bouquets from her own garden.

Kyle Carleton brings over 13 years of environmental construction experience to GSS. With a professional background as a foreman, equipment operator, and field technician, he offers a practical, hands-on perspective as a Project Manager. He is an expert in managing complex remediation projects, including high-hazard emergency response and marine environments.

At GSS, Kyle specializes in projects that require real-time adaptation and creative problem-solving. He thrives on the unique nature of the work, navigating shifting industry regulations and narrowing disposal options to find collaborative, cost-effective solutions. He views each project as an engineering puzzle, focusing on the technical precision required to restore a site to its natural state.

When he is not on a job site, Kyle recharges by camping and fishing with his family.

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.