Professor Evans received the Nobel Prize for a series of groundbreaking discoveries concerning embryonic stem cells and DNA recombination in mammals. He gave the 2009 Clinical Prize Lecture on the subject of ‘Stem Cells: Past, Present & Future’. The lecture was introduced by Professor Anthony Segal (UCL Centre for Molecular Medicine) and attended by UCL President and Provost Professor Malcollm Grant, to a full house in the UCL Cruciform Building.