Researchers who have worked at NPL include Donald Davies, who co-invented packet switching in the early 1960s;[2] D. W. Dye who did important work in developing the technology of quartz clocks; Louis Essen, who invented a more accurate atomic clock than those first built in America. Others who have spent time at NPL include Harry Huskey, a computer pioneer; Alan Turing, one of the fathers of modern digital computing who was largely responsible for the early ACE computer design; Robert Watson-Watt, generally considered the inventor of radar, Oswald Kubaschewski, the father of computational materials thermodynamics and the numerical analyst James Wilkinson. H.J. Gough one of the pioneers of research into metal fatigue worked at NPL for 19 years from 1914-38. The inventor Sir Barnes Wallis did early development work there on the "Bouncing Bomb" used in the "Dam Busters" wartime raids.[3] Sydney Goldstein and Sir James Lighthill worked in NPL's aerodynamics division during WW2 researching boundary layer theory and supersonic aerodynamics respectively. Dr.Clifford Hodge also worked there and was engaged in research on semi conductors
