Our Team

Amanda Bisson – Project assistant

Amanda Bisson specializes in office management, editing, and report production and serves as the vital first line of communication for clients and the community. Prior to joining our team in 2011, Amanda worked as an administrative and project assistant for an international environmental consulting and engineering firm.

Ava Lindberg – Accounting Assistant

Ava Lindberg is St.Germain’s Accounting Assistant. Ava oversees the company’s accounts payable and accounts receivable processes. She has a background in accounting as well as customer service and is a great addition to our team. In her spare time, she is a mentor for the Bonny Eagle Robotics Team (BERT 133).  

Cheryl Ahearn – CONTROLLER

Cheryl Ahearn is the Controller at St.Germain. She has a strong background in accounting, with more 30 years of experience providing business accounting consulting services. Cheryl oversees all accounting functions at St.Germain including accounts payable, accounts receivable, payroll compilation, budgeting, forecasting, and financial reporting.

Ellen Rathbone image

Ellen Rathbone – Project Manager & Regulatory Specialist

Ellen Rathbone is a Project Manager & Regulatory Specialist on the St.Germain team. In this capacity, Ellen researches environmental, fire and safety regulations specific to client projects and develops solutions to assist clients in maintaining and strengthening their compliance programs and permitting new facilities, including compliance management systems, web-based employee training programs, regulatory reporting, emergency plans, and state and local development permits.


Erin Pike is a Senior Project Manager and the Lender Services Manger on the St.Germain team. Since 2005, her experience includes groundwater monitoring and reporting, tank removals, soil removal supervision, installation of monitoring wells, and project management. Ms. Pike also manages Lender Services and is experienced in conducting desktop reviews, Transaction Screens, and Phase I and II Environmental Site Assessments (ESAs) in accordance with ASTM standards at both commercial and rural, forested parcels.


Gordon joined St.Germain in January 2023 after spending a decade working in environmental management and regulatory compliance at a paper mill. He has experience managing regulatory programs for wastewater treatment, major source air emissions associated with cogeneration boilers and off-machine coating, and hazardous waste generation. He has also been a lead auditor for the ISO 9001, 14001, and 45001 standards and has worked with various industry groups to write and present positions on proposed legislation and agency rulemaking activities. On a day-to-day basis, Gordon manages projects and assists clients with their air, water, and waste programs’ operational and regulatory needs, always aiming to understand the entire context of their activities to ensure they identify and meet the full scope of their regulatory obligations.

Eugene McKeen– Project Manager & EHS Specialist

Eugene “Gene” McKeen is a Project Manager and EHS Specialist on the St.Germain team. His specialized skill set includes the implementation and oversight of Quality Management Systems, the development and administration of training for production and quality personnel, and the oversight of EHS programs for large industrial facilities. Prior to joining St.Germain, Gene worked as a Quality and Safety Manager at a large industrial company, overseeing quality, safety and health, and facilities management.

Gabriel McGinn – Environmental Scientist

Gabriel “Gabe” McGinn is an Environmental Scientist who has experience in soil, groundwater, air, and vapor sampling. He performs Phase I and II Environmental Site Assessments and underground storage tank (UST) closure assessments. Gabe has experience with direct-push Geoprobes, including the installation of soil borings and monitoring wells. He will be assisting St.Germain’s clients by investigating and remediating environmental contamination at a variety of commercial and industrial sites.

 Joe Clayton – Environmental Scientist

Joe Clayton is an Environmental Scientist whose scientific background ranges from wildlife biology to lab work to brewing. In his work at St.Germain, he spends much of his time in the field, visiting sites to retrieve water levels and take soil, water, and air samples that inform detailed reports and recommendations, including ways for clients to blend environmentally – friendly strategies into their site plans.

Isaiah bates – Environmental Scientist

Isaiah Bates is an environmental scientist with a broad understanding of Maine’s regulatory requirements for new development, having worked on a wide range of land surveying and local and federal permitting initiatives for civil engineering projects in the state. At St.Germain, he supports several service areas including compliance, environmental assessment, and environmental health & safety (EHS). He particularly enjoys helping clients through the many stages of new development, from site walks and due diligence to meetings with the DEP, ACOE, and local planning boards.

John Marchewka, L.G. – Senior Project Manager & Senior Environmental Geologist

John Marchewka has over 30 years of experience working in the environmental and geological consulting industry. He is a Senior Project Manager with the St.Germain team, with expertise in client support, regulatory negotiations, and strategic project planning.  Mr. Marchewka has completed successful environmental assessments and remediation at many commercial and industrial facilities, including hazardous waste site compliance and investigation, aggregate recources permitting and assessment, and petroleum and hazardous substance tank closure and remediation. John is a Maine Licensed Geologist.

Kristopher Plante – Environmental Scientist

Kris Plante is an Environmental Scientist helping St.Germain’s clients investigate and remediate environmental contamination at a variety of commercial and industrial sites. He performs Phase I and II Environmental Site Assessments; underground storage tank (UST) closure assessments; and soil, groundwater, and vapor sampling. Prior to joining St.Germain, Kris worked as an Environmental Scientist at an environmental firm in Massachusetts.

Libby Johnson, Office Administrator

Libby Johnson has several years of administrative and office management experience spanning various industries, and has spent much of her career managing an office and providing high-level support to executive teams. At St.Germain, she provides essential operational support to the management team and employees, with responsibilities that range from planning large company events to assisting with day-to-day tasks, overseeing marketing initiatives, and more.

Jim Greer, Civil Designer

Jim Greer is a Civil Designer who brings over a decade of civil drafting and design experience to the St.Germain team. A Gorham, Maine native, Jim’s career spans from technology education to hands-on construction work, to a wide variety of civil engineering projects. At St.Germain, he lends his diverse skills in site layout design, civil drafting, and on-site GPS and drone data collection to our engineering team, assisting with a range of projects including stormwater engineering, permitting, and site development.

Josh Hogan, Civil Engineer

Josh Hogan is a Civil Engineer who gained over a decade of engineering experience from Ireland to the Pacific Northwest before joining the St.Germain team in 2024. Josh’s design experience includes mixed use and multifamily residential developments, complex stormwater management system, and site design and construction plans. He also brings project management skills and extensive drafting experience on a variety of commercial, industrial, and residential projects. Josh earned his Bachelor of Engineering degree (with a focus in Civil Engineering) from the Dublin Institute of Technology. He is a certified Engineer Intern and is currently working toward his Professional Engineer license.

Mark St.Germain – President

Mark St.Germain is President of St.Germain, responsible for quality control, human resources and client satisfaction. Mark has extensive expertise managing multi-disciplined projects requiring environmental investigation, remediation and redevelopment. He has been designing and permitting waste management and material recovery facilities since the early 1990s and has served the petroleum industry since the late 1980s. 

Nate Harvey – Environmental Engineer

As an Environmental Engineer, Nate supports the engineering practice area, as well as the EHS Compliance and Environmental Assessment & Remediation practice areas. He helps with engineering design, permit reviews, and field services including site inspections, environmental site assessments, and sampling for compliance. Nate earned his B.S. in Environmental Engineering (with a focus on chemistry and water/wastewater treatment) from The University of Colorado Boulder. He is a certified Engineer Intern in the State of Maine and is currently working toward his Professional Engineer license.

Patrick Coughlin – Principal & Director of Engineering

Patrick Coughlin is a Principal and Director at St.Germain, specializing in creating comprehensive solutions for clients, from the design and permitting of commercial sites to Sentry EHS, our cloud-based compliance software. Patrick’s expertise over several decades includes compliance systems, energy and solid waste facilities, environmental site restoration, and due diligence for mergers and acquisitions.

Paul Prescott – Senior Environmental Scientist

Paul Prescott has over 25 years of experience performing environmental investigations of various media including soil, groundwater, surface water and soil vapor.   Mr. Prescott is a Senior Environmental Scientist on the St.Germain team and provides expertise in hazardous waste and petroleum site investigation and closure, closures of petroleum and hazardous substance tanks, vapor intrusion (VI) investigations and environmental due diligence.

Thalia Harrington, PE – Project Manager

Thalia Harrington is a Project Manager who works with clients on regulatory reporting; spill prevention and stormwater plans; permitting and licensing; compliance assessments; onsite outsourcing; and other technical EHS support. Thalia is a licensed PE in Maine and New Hampshire. She works with clients in the solid waste & recycling and energy & petroleum industries with their compliance and design needs. Prior to joining St.Germain, Thalia was a Special Waste Environmental Analyst at Casella.


Dylan is a happily retired greyhound adopted through the Maine Greyhound Placement Service. She raced proudly in Florida and is now living the good life in Maine. In her free time she enjoys sleeping, belly rubs, yummy treats, not running, eating grill grease…..and did we mention sleeping? She shares an office with Mark St.Germain. 


George is a young Pup in Training (PIT) born and raised in Gorham who lives in Westbrook. He’s a people-puppy who spends most of his time playing fetch, zooming through the snow, zipping through the woods, and seeking alliance with his cat-roommates. He shares an office with Nate Harvey, spending most of his time on-duty seeking out milk bones and reminding Nate when to take a break.


Sally is a two-year-old husky mix. She loves the outdoors, including going to the beach and hiking in the mountains. Sally is very independent and prefers other dogs to people. She shares an office with Gabe McGinn.


Sam was adopted from Alabama and has enjoyed living in Maine for the past 10 years. Sam enjoys chasing chipmunks, squirrels, etc., playing in the snow, laying in the sun, rolling in the grass, ear rubs, naps, and treats. He shares an office with Erin Pike.