Keith is a Founding Partner of Feilden Clegg Bradley Studios. He joined the practice in 1987 and in 1998 he set up the London office, with subsequent offices in Belfast and Manchester.

Keith has led significant FCBStudios projects, with over 50 receiving RIBA, Civic Trust, sustainability and housing awards. Keith led the 2008 RIBA Stirling Prize winning Accordia housing project in Cambridge and currently leads on mixed-use, regeneration and masterplanning schemes throughout the UK. His buildings include The Earth Centre Galleries in Yorkshire, museums at RAF Hendon and Cosford, the UCL London Centre for Nanotechnology, the MMU Business School and the Manchester School of Art, which was shortlisted for the 2014 Stirling Prize.

More recently completed projects include the Ulster University’s Belfast City Centre campus - a 75,000sqm relocated high density urban campus in the centre of Belfast - and the Warwick University Faculty of Arts, research, teaching and learning building.

Keith has co-authored several FCBStudios books and publications. He is a guest lecturer at Schools of Architecture in the UK, and a frequent speaker at conferences, including regular contributor and judge of the World Architecture Festival. He is a Design Council Ambassador and previous Chair of CABE National Design Review panel and Oxford Design Review Panel. He was awarded an honorary doctorate by the University of Bath in 2018.