David Barrett, Executive Chairman
David co-founded SigmaRoc plc together with Max Vermorken and Charles Trigg and has been its Chairman since January 2017.
Previously he co-founded London Concrete in 1997, subsequently building the business from one concrete plant in London to over a dozen plants around the capital.
London Concrete was sold to Aggregate Industries and is currently the number one concrete supplier in London, with flagship projects such as the London Olympics, the Shard, the US embassy and the new Bloomberg building.
Having previously worked with Pioneer, David retired from London Concrete in 2015 and is widely considered an expert in the industry.