Geotechnical consulting engineers offering expert and forensic investigation services, and geotechnical design specialising in hillside building advice. Located in Australia. Shirley Consulting Engineers is a Sydney-based Geotechnical, Civil & Forensic Engineering practice that specialises in the investigation & evaluation of failures in geotechnical and civil engineering structures; the firm is also extensively involved in the assessment of slope stability, foundation capacity, earthworks / rock excavations and retaining systems for the purposes of site development.