About Subsurface Geotech

At Subsurface Geotech Inc. (SSG), we specialize in geotechnical and environmental engineering, providing cutting-edge solutions for deep foundations, tunnel construction, and complex subsurface challenges. Our expertise spans design, inspection, instrumentation, and testing services, ensuring safe, high-performance infrastructure across Canada.

With decades of experience, our engineers are industry leaders in deep foundation inspection and testing, as well as instrumentation and monitoring programs for vibration control, structural movement, earth fill stability, and tunnel/shaft integrity. Every project benefits from hands-on expertise, as a senior engineer is always involved from field testing and data collection to in-depth analysis and reporting.

At SSG, precision, strength, and innovation define everything we do. We are committed to delivering reliable, high-quality solutions that enhance safety, efficiency, and sustainability in the construction industry. Whether you're tackling a complex tunnel excavation, deep foundation design, or vibration monitoring project, we provide the expertise and technology to get the job done right.

Built for Performance. Engineered for Safety. Trusted for Excellence.

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Our Team

  • Patrick Cullen, P.Eng., PE – Co-founder

    Patrick is a civil engineer specializing in deep foundations, geotechnical instrumentation, and embankment monitoring across Canada and the U.S. A Carleton University graduate in Civil Engineering with a Management Concentration, he brings extensive experience in design, inspection, testing, and analysis for highway transportation, oil & gas, and building construction. Committed to safety and client service, he ensures excellence both on-site and in the office.

  • David Fitzgerald, P.Eng., ing. – Co-founder

    David is a deep foundation specialist with extensive experience in inspection, testing, and analysis across Canada and the U.S. A Carleton University Civil Engineering graduate, he has contributed to hundreds of projects, specializing in pile testing methods such as PDA, CSL, SQUID, TIP, BIT, SHAPE, and Static Load Testing. His expertise in data analysis and problem-solving ensures safe, efficient, and cost-effective foundation construction.

  • Shawn Ferguson, P.Eng., PMP – Vice President 

    Shawn brings extensive experience in geotechnical drilling, investigation, and instrumentation for highways, bridges, excavations, and tunnels across Ontario. Known for his innovative fieldwork approach, he ensures seamless operations alongside active construction while effectively communicating key insights to stakeholders.