Gustav Ludwig Hertz (German: [ˈɡʊs.taf ˈluːt.vɪç hɛʁt͡s] ⓘ; 22 July 1887 – 30 October 1975) was a German atomic physicist who shared the 1925 Nobel Prize in Physics with James Franck "for their discovery of the laws governing the impact of an electron upon an atom".