Every day, people around the world live, work and play on ground prepared by Keller, the world's largest geotechnical specialist contractor. Used alone or in combination, our techniques solve a wide range of challenges across the entire construction sector – from industrial, commercial and housing projects to infrastructure construction for dams, tunnels, transportation and water treatment, as well as projects to address environmental challenges. Global strength and local focus are what makes us unique. Our knowledge of local markets and ground conditions means we’re ideally placed to understand and respond to a particular local engineering challenge. Our global knowledge base then allows us to tap into a wealth of experience, and the brightest minds in the industry, to find the optimum solution. With around 10,000 employees and operations across five continents, we have the people, expertise, experience and financial stability to respond quickly, get the job done and see it through safely. By connecting global resources and local knowledge, we can tackle some of the largest and most demanding projects around the world but the everyday work we do is just as important and, in total, we tackle an unrivalled 6,000 projects every year.

In 1924, New Enterprise Stone & Lime Co., Inc. began as a commitment between J. S. Detwiler and his son, Paul I. Detwiler. Over the next two decades, J. S. and Paul acquired several other quarries in addition to blacktop and ready mix concrete plants. In 1949, J. S. included his other sons, Emmert, Dale, and Galen, in the company’s operations. After the company incorporated in 1950, the four brothers expanded and diversified NES&L Co., Inc., adding precast/prestressed concrete plants, concrete pipe plants, and more quarries. During the 1970’s, NES&L Co., Inc. acquired Martin Limestone, Inc. in Blue Ball, Pennsylvania, and Valley Quarries, Inc. in Chambersburg, Pennsylvania. In 2000, the company added Buffalo Crushed Stone, Inc. in Buffalo, New York, to its list of subsidiaries. In 2002, the company acquired Lancaster Stone. Stabler Companies Inc. and certain of its subsidiaries were added in 2007, expanding their services throughout the United States. The commitment that began between father and son continues today in this family-owned corporation guided by fourth- and fifth-generation Detwilers. That commitment comes from company personnel as well, since many of them are third- and fourth-generation employees. The Pennsylvania Department of Community and Economic Development named NES&L Co., Inc. one of the 50 best places to work among companies with 250 or more employees. From one quarry to a myriad of production facilities, quarries, and contracting services, NES&L Co., Inc. continues to strive to be a leader as a building materials supplier and highway contractor.

The State Retirement and Pension System, or SRPS, or "the System", administers death, disability and retirement benefits on behalf of more than 350,000 members. These include active and former State employees, teachers, State police, judges, law enforcement officers, correctional officers and legislators.

William A. Hazel, Inc. is a total site development company with over 50 years of experience, passion and skill. Engaged in all aspects of site development and road construction throughout Northern Virginia. Base out of 4305 Hazel Park Court, Chantilly, VA

BOARD OF TRUSTEE OF THE GLIDE FOUNDATION is a company based out of 330 ELLIS ST 316, San Francisco, California, United States.

Engaging technology and best practices to give our clients an exceptional construction experience… At Barnhill, we are builders at heart. Our company offers commercial building, site infrastructure, transportation and asphalt services throughout the Southeast and is consistently ranked among ENR’s Top Contractors in the US. With more than 70% of our business coming from repeat clients, our success is built on the vision of the man – Robert E. Barnhill, Sr. – whose name we proudly bear. His passion for people and his firm belief in the Golden Rule – treating others as you want to be treated – still drive us today. Values We are firm, flexible and honest and do the right thing, every single time. We empower our leaders in the field to be decision makers. We are easy to work with – a core philosophy that is both intentional and deliberate. One that requires discipline. Grit. All of these qualities, along with our founder’s vision, have helped grow Barnhill into one of the Southeast’s leading contractors. Leadership Today, the company is led by Rob Barnhill who represents the third generation of management. He continues both his grandfather and his father’s vision of the business, leading the company to even greater levels of success. Bob Barnhill continues to direct the company in his role as chairman of the board and chief executive officer. Together, Rob and Bob have a clear vision for the future and the qualities that shaped the company. Community Investment Our mission is to make a positive impact in our communities by supporting organizations and causes that are important to our business, communities and employees. Each year we set aside time and money to make investments that have a positive impact. We care about being good citizens. Giving back to our communities is consistent with our foundation, supports our employees and is good for business. What we get back far exceeds our contributions.