After working at Manchester University under Rutherford, he went to work with Hans Geiger in Leipzig in 1913. Interned for the duration of World War I, he joined Rutherford in Cambridge after the war. In 1932 he discovered the neutron, as predicted by Rutherford. In 1935 he was awarded the Nobel Prize, the same year in which he built Britain’s first cyclotron at Liverpool University. He also performed important experiments on beta decay, which were very influential on subsequent developments in weak interaction theory. In addition, he was one of the first people to recognize the existence of the strong interaction.