David has over 40 years experience of civil and ground engineering at the heart of major projects worldwide, characterised by an enquiring mind and a passion for innovation. Key career innovation milestones include:• Invention of the award winning King Sheet Piling (KSP®) retaining wall system (UK patent GB2463079) used in over 25 km of retaining wall on the M25 DBFO widening, Europe’s largest land-based use of sheet piling. Visit www.ksp-piling.co.uk for more detail.• Introduction on the A421 of the first use world-wide on a major road of tyre bales as lightweight fill.• Design responsibility for world’s largest circular sheet pile cofferdam at 60 m diameter for Santa Rita power station in the Philippines.• Initiation of and design responsibility for the first major use of soil nailing in the UK in a 10m vertical wall for Austin Rover at Longbridge.• Conception and use of the only known coupling of 350 mm square precast upper pile sections to 275 mm square lower sections to optimise lateral and axial pile load capacity for Barking Reach Power Station.• Introduction of the first UK reinforced soil bridge abutments on Carmarthen Southern Bypass.