Lonnie Pack is a chartered professional engineer (CPEng) through Engineers Australia, and a registered professional engineer of Queensland (RPEQ) and Victoria (BLA). He is also listed on the National Engineering Register (NER). Lonnie is the Director of Pack Engineering, where he investigates failures in engineering and construction, and provides expert witness services. Lonnie is also a Senior Principal Structural Engineer at Tetra Tech, where he previously managed the Structural Engineering department for the east coast of Australia, and the Geotechnics department (Coffey) for Queensland. Brian Kinnear has 40 years of structural design experience in the UK and Australia. He is a chartered professional engineer with Engineers Australia (CPEng), a registered professional engineer of Queensland (RPEQ) and a Member of the Institution of Structural Engineers (MIStructE). Brian has been principal engineer on various major infrastructure projects throughout his career.