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GMSCORP is a family-owned business based out of Western Maryland and West Virginia.  Employing over 1100 people that serve businesses in several locations within the continental United States and abroad.   Our company has proudly served the energy and construction sectors for over 30 years. 

Founded in 1983 as a bit sharpening company for the mining industry, GMS has grown to be The Professional Contracting Company to the energy segment. Our wide array of products and services allow us to adapt to constantly changing markets and grow in times of uncertainty. Providing careers and futures for over 1,000 employees is something that we do not take lightly and we strive every day to make our customers stronger and give our employees a better life.


Our Principles


Safety, Quality, and Efficiency - the 3 principals that have allowed us to be successful. These principles not only apply in our customer relationships, but these are also the qualities we look for in employees.

Our Standards

If GMS puts our name to a project you can guarantee that we are standing by it. Our standards go above and beyond any other company, and the work we do will reflect that. Our involvement from start to finish allows a true turnkey approach to almost every service we offer which makes us accountable and gives our customer’s results.


Our Services

If you call on GMS for any need, no matter how small, you are guaranteed professional customer service that produces results. We don’t just have customers, we know our customers. We listen to our customer’s needs, work with them to make recommendations, and build trust and relationships through quality work.


GMS was founded in 1983 as a mining construction company which has grown into an elite, well-rounded construction company that takes pride in tackling a wide array of jobs.  We have etched our reputation by tackling jobs from small projects to complicated builds and designs.  The most valuable resource at GMS is OUR PEOPLE.  Our focus is to train and develop the highest quality construction professionals in the industry.  Our construction professionals are supported by a first class engineering departement and three state of the art fabricaiton facilities across the United States.  GMS is true "Turn Key" Contractor (engineering/design, fabrication, and installtion).  One contractor and one margin. 

GMS Land Design & Waterscapes serves as the contractor for any outdoor needs.  From outdoor kitchenettes to customized swimming pools, we take great pride in being a wholesale provider and turnkey installer.  Our specialties include retaining walls, pavers, dry-stack stone, outdoor kitchens and patios, waterscapes, decorative and stamped concrete and Viking pools and spas.  Visit our website to learn more.

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The mission of Advantage Partner is to provide the absolute best staffing services for clients in West Virginia, Pennsylvania, Maryland and the surrounding area.  We will strive for nothing less than 100% customer satisfaction while building strong, long-term relationships with our clients ensuring repeat business and exceptional growth through referrals. At Advantage Partner we focus on intangible qualities and high character individuals which creates the strongest retention model possible. We make the extra effort to locate candidates who will fit within your existing culture. We will work diligently to meet all your needs with a smile on our face. This is a relationship business. Advantage Partner will manage all clients and employees through relationship building. Elevate your staffing success today with Advantage Partner.


Advantage Partner is a local firm that costs less than a consultant or other employment agencies. Advantage Partner will provide services for both project and long-term needs, and has an easy pay and billing rate system that covers employee payroll and worker's compensation insurance.

There are a variety of reasons why businesses may need Advantage Partner’s services:

  • Seasonal increases in work load

  • Organization grows and expands to areas that the company is unable to currently meet in-house.

  • Special events

  • FMLA leave

  • Business increases after layoffs

  • Ongoing turnover issues

  • Smaller business that does not yet have staff on-hand to complete extra projects that arise

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Built on a strong foundation of personal attention to our customers, safety, quality products and reliable delivery.

Garrett Industrial Supply is a regional leader in the supply industry. We serve customers in the mining, gas/oil fields, logging, excavating, trucking and chemical industries as well as state and local government. We are customer driven company more interested in establishing relationships than individual sales.


With offices in Oakland, MD, Morgantown, WV and Jane Lew, WV, we are well positioned and have the capabilities to service not only the Marcellus and Utica Shale exploration/development plays in the Appalachian Basin, but also provide nationwide solutions via our mobile transport division.

Certified and established, the Low Pro low vein hardhat has become a staple in mines across the country.   If you're a coal miner and want the safest, most comfortable hardhat on the market, check out the Low Pro product line by visiting

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