Purestone employs more than 20 staff and was founded by head of client services Simon Butler and strategy and planning director James Smee. It has worked for clients including adidas, ASOS, UK Mail, PayPal, Freshfields, Royal Bank of Scotland and Towers Watson.
The move quadruples the size of Lewis PR’s London-based digital team to 25 and expands its skillset to include e-commerce, email, mobile and app development, bolstering its social, SEO and web production services.
Lewis PR group managing director Giles Peddy said: "Where we see the industry going is towards the integration of digital marketing and communications, and Purestone adds technical capabilities we didn't have before."
Lewis PR last year launched its digital marketing services practice Lewis Pulse across six hub cities: Barcelona, Boston, Eindhoven, London, San Francisco and Singapore. It now plans to continue its expansion in Europe and Asia, opening more Lewis Pulse offices.