Parrish Structural Reinforcements (PSR) was founded on a singular commitment: delivering specialized, highly reliable geotechnical and structural engineering solutions for the infrastructure that keeps our communities moving. As modern transportation and heavy civil projects grow increasingly complex, the need for deep technical precision in Earth Retention Systems (ERS) and retaining wall engineering has never been greater. PSR fills a critical niche in the civil engineering landscape, serving as a dedicated, agile partner capable of bridging the gap between high-level structural design, geotechnical realities, and constructability on the ground.
At the core of our firm’s success is a culture rooted in direct collaboration and practical problem-solving. We recognize that specialty wall engineering does not occur in a vacuum; it requires seamless integration with contractors, wall suppliers, geotechnical consultants, and agency owners. By pairing deep technical knowledge with a clear understanding of project delivery systems—such as Design-Build and Accelerated Bridge Construction (ABC)—we deliver tailored engineering calculations, clear contract drawings, and independent technical reviews that streamline agency approvals, mitigate field risk, and keep critical path schedules on track.
Whether engineering complex mechanically stabilized earth (MSE) walls with tight geometry, designing custom precast concrete components, or resolving high-load structural interfaces on major highway corridors, PSR brings steady leadership and tested expertise to every phase of a project. Led by seasoned industry experience and a passion for engineering excellence, we are dedicated to building long-term partnerships founded on technical accuracy, clear communication, and dependable execution.
MSE walls are a core focus of our practice. Our experience includes permanent and temporary systems, extensible and inextensible reinforcement, complex wall geometry, structural interfaces, traffic barriers, constrained reinforcement conditions, difficult foundation conditions, and hybrid retaining structures.
We place a high value on doing what we say we will do. Our clients and project partners rely on us for accurate engineering, responsive communication, and dependable project delivery.
We focus on solutions that are technically sound, clearly detailed, and appropriate for the specific project conditions rather than treating every wall as a standard application.
Our engineers have supported major transportation design-build projects involving hundreds of thousands of square feet of retaining walls. We understand the coordination, schedule, documentation, and technical demands associated with large infrastructure projects.
We develop and refine engineering tools, calculation procedures, drawing standards, and quality-control processes to improve both the reliability and efficiency of our work.
Complex projects rarely fit neatly within standard details. We listen to the contractor, supplier, design team, and owner, understand the problem, and work collaboratively toward a technically sound solution.
Matthew Parrish is the Founder and President of Parrish Structural Reinforcements and a Professional Engineer specializing in retaining wall and reinforced soil structures.
Matt has more than 13 years of specialized experience in retaining wall analysis, design, detailing, and technical review. His experience includes permanent precast-panel MSE walls, temporary and permanent wire-faced MSE walls, precast modular block walls, reinforced soil structures, soil-nail fascia, hybrid retaining systems, and walls supporting major transportation infrastructure.
Throughout his career, Matt has served as a lead MSE wall engineer on major highway and design-build projects across the United States, including projects approaching one million square feet of retaining walls.
Before founding PSR, Matt served in engineering leadership roles with firms specializing in MSE wall systems and transportation structures, including Regional Engineer positions with The Reinforced Earth Company and Inventure Civil. That experience gives PSR a background grounded in both specialty wall-system engineering and consulting engineering for major infrastructure projects.
Matt is licensed as a Professional Engineer in 21 states and currently serves on the Transportation Research Board Standing Committee on Structural Foundations. He previously served on the TRB Standing Committee on Transportation Earthworks.
Today, he leads PSR’s technical practice and remains directly involved in the firm’s engineering and technical review.
Partner with our team from early-stage planning through final stamped design to prevent constructability issues, streamline approvals, and build with complete technical confidence.