David T. Cliff FRSA FIMA FBCS CITP (born 1966) is a Professor in the Department of Computer Science at the University of Bristol[2] and was formerly the Director of the UK Large-scale Complex IT Systems (LSCITS) Initiative.

[10][11][12] Cliff spent the first seven years of his career working as an academic, initially at the University of Sussex UK and then as an associate professor in the MIT Computer Science and Artificial Intelligence Laboratory, Cambridge USA.

In 2011, Cliff and Linda Northrop (Director of the USA's Software Engineering Institute's ULSS Project) jointly authored a paper on the global financial markets as ultra-large-scale systems, commissioned by the UK Government Office for Science.

In addition to Cliff, the other members of the LEG were Philip Bond, Clara Furse, Charles Goodhart, Andy Haldane, Kevin Houstoun, Oliver Linton, and Jean-Pierre Zigrand, co-director of the Systemic Risk Centre.

Other scientists involved in GCSE Science Live shows include Maggie Aderin-Pocock, Jim Al-Khalili, Richard Dawkins, Ben Goldacre, Steve Jones, Sir David King, Simon Singh and Lord Winston.