John Krebs, Principal, Jesus College, Oxford Professor Lord John Krebs is the Principal of Jesus College Oxford. He has held positions at the University of British Columbia, University of Wales Bangor and Oxford University, where he was a Royal Society Research Professor from 1988-2005. Between 1994 and 1999 he was Chief Executive of the Natural Environment Research Council and from 200-2005 he was the first Chairman of the UK Food Standards Agency. He is an independent cross bencher in the House of Lords, where he chairs the Science and Technology Select Committee. He also chairs the UK Climate Adaptation sub-committee and is a Trustee of the Nuffield Foundation.