Chris Williamson co-founded Weston Williamson after being selected for the 1985 RIBA 40 under 40 exhibition. Some thirty years later, the practice has grown from a partnership working from Williamson's spare bedroom to a workforce of 150 with studios in London, Sydney and Melbourne. His light installation Midnight Sun was a featured attraction in this year's Vivid Sydney Festival of light, music and ideas.

Williamson was the partner in charge of the Jubilee line station at London Bridge and has led projects for Crossrail at Paddington and Woolwich; the DLR extension to London City Airport, Woolwich and Stratford and Pudding Mill Lane.

Other infrastructure and urban planning projects include: High Speed 2; London Overground; Network Rail; Docklands Light Railway; Transport for London; Dubai Transport Authority; Malaysian Transport Authority; Sydney and Melbourne Metro.

He is currently the RIBA Vice President International and former Ambassador for Business Skills.