David J. C. MacKay, English physicist, engineer, and academic (died 2016)

Sir David John Cameron MacKay was a British physicist, mathematician, and academic. He was the Regius Professor of Engineering in the Department of Engineering at the University of Cambridge and from 2009 to 2014 was Chief Scientific Advisor to the UK Department of Energy and Climate Change (DECC). MacKay wrote the book Sustainable Energy – Without the Hot Air.