Who we are

G&A is an employee owned firm with over 200 professionals throughout eastern Pennsylvania. We have grown in a carefully planned fashion along with the growth of the region by offering a wide variety of design, engineering, and consulting services and successfully representing over 75 local municipalities/authorities. The Firm continually ranks as one of the top regional engineering and consulting firms by the Philadelphia Business Journal, a success achieved by always trying to understand our clients, their needs, and working with them to a successful project completion.

For over a century of professional practice, G&A has instilled confidence and trust in our clients that we will meet the unique needs of every project. That experience has taught our firm the importance of responsiveness and the true value of teamwork. As a practice leader, we embrace our responsibility to provide environmentally and economically sustainable designs for our clients and the communities we serve. Our history feeds a philosophy that promotes resilient solutions to the complexities of an aging infrastructure. G&A goes beyond the traditional engineering and consulting firm, offering tailored solutions to our client’s challenges.

G&A is the successor to the original professional practice started by W.O. Weisel in 1918.  G&A’s founder and patriarch, Robert “Bob” Gilmore, R.S. developed a professional staff representing expertise in the fields of engineering, surveying, planning, and landscape architecture, offering “Creative engineering and planning for protection of our environment and conservation of our resources.” Bob later handed the reins of the firm’s leadership to his son, Steven D. Gilmore, P.E. who was instrumental in continuing the firm’s expansion for over 40 years, holding true the values and mission of the established legacy of high performance and excellence.

In 2017 Steve transitioned the role of CEO & President to Scott Muller, P.E., P.L.S. as part of the planned succession process culminating in the 100% employee owned firm.  Since that time Scott has honored the legacy established by the Gilmore Family while leading the firm to new and greater achievements.

In January 2026, G&A was pleased to announce a planned leadership restructuring, after nearly a decade of leadership as CEO and President, Scott Muller will now solely focus his  efforts on CEO duties. In place of his role as President, G&A named two division presidents to better serve our expanding client base as well as our growing number of employee-owners. 

Eric Clase, P.E. was named President of our Civil Design Division and Erik Garton, P.E. named President of our Municipal Division. 

For decades, Eric has guided G&A’s civil design division, cultivating client relationships and mentoring our design team who not only handle but exceed our client’s expectations.  Many of Eric’s signature projects become economic drivers in the region, positively impacting our community.  His track record of dealing with difficult design challenges and getting results for our clients is a testament to his professionalism and ingenuity.

Since joining G&A nearly 25 years ago as an intern, Erik has gained a broad knowledge and expertise in engineering, business strategy, and client relations.    As his role and responsibilities have grown, he has focused on being a leader in the firm’s municipal engineering practice.  Erik understands the intricacies and challenges our municipal clients face and has become known as a dedicated and reliable resource for our clients.  Through Erik’s guidance, our municipal division has grown substantially over the last two decades into an impressive and experienced team who regard Erik as a trusted leader.