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Michael Grover, Environmental Site Assessment Manager, UMASS Amherst

Management Team

Mark Hellstein - President and Chief Executive Officer

MarkHellstein_cropped-977362-edited.jpgMark started ECS in 1982 out of the basement of his parents' home.  Prior to that, he was part of a team at Hamilton Standard that was working on a project funded by the Environmental Protection Agency (EPA) to develop new industrial pretreatment standards. When the funding was discontinued, he left Hamilton Standard to "do his own thing." After a year of struggling, ECS was established with the basics: a shovel, a pickup truck, and a thorough understanding of the new regulations that stipulated what companies were and weren't allowed to release into the air, ground and water.

Three decades later, Mark sits at the helm of an employee-owned company with 14 offices, 200 professionals, divisions focusing on specialized services such as alternative energy and fuel systems management, and true differentiators such as an in-house, 24/7 response management hotline. 

ECS prides itself on being the sort of company that embraces the entrepreneurial spirit and encourages its employees to do the best that they can, and Mark is the true embodiment of this philosophy.


Kevin Sheehan, PE, LSP, LEP - Corporate Operating Officer

kevin_sheehanKevin has been an integral part of the ECS team since 1989. He has 30 years of experience in providing technical expertise and regulatory insight for clients regulated by the Massachusetts Contingency Plan (MCP), the Resource Conservation and Recovery Act (RCRA), and the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA). He played a major role in establishing what is now the Bureau of Waste Site Clean-Up group in the Western Regional Office of the Massachusetts Department of Environmental Protection. He was also involved in the writing of the original MCP that was promulgated in 1988. Kevin has managed hundreds of projects ranging from property transfer site assessments to hydrogeological assessments of large industrial facilities.

Additionally, he provides technical guidance and mentoring for ECS staff, guidance on corporate strategy, and oversees corporate major account relationships.  Kevin is also responsible for the firm's Health and Safety department.

Kevin is a Massachusetts Licensed Site Professional (LSP), a Connecticut Licensed Environmental Professional (LEP), and a Professional Engineer (PE) in Massachusetts, Connecticut, Vermont, Florida, and North Carolina.


Douglas McVey - Chief Financial Officer

DougMcVey2_croppedWhile working as an environmental technician on a major petroleum account for a competitor, Doug found himself drawn to the entrepreneurial spirit of ECS and made the move in April 1999. He went to work at ECS’ Brattleboro, Vermont office, which at the time was a rambling red barn situated on acres of farmland. As a project manager, Doug focused on site assessment and brownfield redevelopment services for municipalities, private developers and community development corporations.

Doug transferred to ECS’ headquarters in Agawam, Massachusetts in early 2000 and took on the responsibility of managing the company’s site assessment group. That same year, with the assistance of ECS, he completed his Masters of Business Administration degree.

Upon his return from a two-month sabbatical hiking along the Appalachian Trail from Maine to Massachusetts, Doug began managing ECS’ accounting department and became Controller and Business Manager. The company was growing quickly at the time, and Doug’s shrewd business planning was a key factor in ECS acquiring another environmental firm in late 2002.

Doug’s financial leadership over the next few years led to him becoming ECS’ Chief Financial Officer in January 2008. He continues to manage the company’s accounting group and is also the ESOP trustee on the Board of Directors.  He is also responsible for the firm's Human Resources department.


Dan Felten, PE, LSP - Senior VP, Technology

DanFelten2_croppedDan has almost three decades of experience in environmental and energy related consulting, contracting and remediation, and he has been a part of the ECS team since 1999.  As our Senior Vice President for Technology, Dan is primarily responsible for technical program implementation and training, as well as new product development. He also oversees the firm's Information Technologies department.

Dan's project experience includes all facets of environmental assessment and remediation for petroleum and solvent releases, compliance/permitting for petroleum and industrial facilities, inspection of aboveground and underground storage tanks, and the design and installation of ground source geothermal systems.

He is a Massachusetts Licensed Site Professional (LSP) and a Professional Engineer (PE) in Massachusetts, Connecticut, New Hampshire, Maine, and North Carolina.

Dan is also an adjunct professor at Greenfield Community College in Greenfield, MA in the Alternative Energy Program.

Jon Berntsen, PG - Senior VP, Director of Strategic and Business Development

JonBerntsen2_croppedJon is responsible for evaluating existing and new business opportunities for expanding ECS’ services lines. He also collaborates with ECS management to identify market trends and key interest groups, and provides leadership with business development-based decisions.  Jon also builds brand awareness for each of ECS’ key business units and represents the firm within local and national trade and business associations. 

Jon began his career with ECS as a Project Manager in the firm’s northern Vermont office. After three years, he relocated in June 2003 to manage the firm’s Brandon, Florida office. When the Brandon operations moved to Tampa in early 2008, Mr. Berntsen was an integral part in overseeing the construction of a new LEED Green Building Certified office, where he managed 20 environmental professionals and support staff.  In 2011, Mr. Berntsen was designated Senior Vice President, Regional Manager and was responsible for the management of ECS’ offices in Florida, North Carolina and Ohio. He transitioned from his branch manager role into his current position in January 2015. 

Jon holds a Bachelor of Science degree in Environmental Geology from Bucknell University and is a licensed Professional Geologist (PG) in Florida, North Carolina, Louisiana, Georgia and New Hampshire.  

Bill Alpine - Director of Cost Recovery/Corporate Counsel

BillAlpine2_croppedBill provides corporate legal guidance to ECS' employees and oversees the firm's state reimbursement claims management program. He is also responsible for all matters pertaining to Real Estate and Facilities.  Prior to joining ECS in 2005, Bill worked for the Commonwealth of Massachusetts for 17 years, the last 12 of which he served as Executive Director of the Massachusetts Underground Storage Tank Cleanup Fund.  He also served as co-chair of the State Fund Administrators Task Force. Bill earned his Bachelor's degree in Marine Engineering from the Massachusetts Maritime Academy, and his Juris Doctorate from Suffolk University.


 Michele Guidry McBrayer, PHR - Director of Human Resources

michele_mcbrayer_oct2014Michele brings over 27 years of experience in business administration, and over 24 years of experience in the specialized management and administration of environmental consulting firms, including over 20 years as Senior Manager. She graduated Magna Cum Laude from Shorter College in Rome, Georgia, and has been an HRCI certified human resources professional since 2005.  She is an exceptionally resourceful member of the ECS Senior Management Team, with responsibilities that include, but are not limited to: administration of all employment policies and procedures, benefits, training, and related programs; management of drug testing/medical monitoring policies, procedures, and related programs; management of health and safety policies, procedures, and related programs; frequent interface with clients, contractors, corporate and branch office personnel; and providing support and solutions to various problems and human resources issues.


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