Arnold Sommerfeld

Arnold Johannes Wilhelm Sommerfeld (German: [ˈaʁnɔlt ˈzɔmɐˌfɛlt]; 5 December 1868 – 26 April 1951) was a German theoretical physicist who pioneered developments in both atomic and quantum physics, and also educated and mentored many students for the new era of theoretical physics.

Sommerfeld served as doctoral advisor and postdoctoral advisor to seven Nobel Prize winners and supervised at least 30 other famous physicists and chemists.

Sommerfeld introduced the second quantum number, azimuthal quantum number, and the third quantum number, magnetic quantum number. He also introduced the fine-structure constant and pioneered X-ray wave theory.

Notable works: fine-structure constant, Bohr-Sommerfeld atom model, Sommerfeld number, Orr–Sommerfeld equation, Sommerfeld identity, Sommerfeld radiation condition, Sommerfeld–Kossel displacement law, Lectures on Theoretical Physics Awards: Max Planck Medal, Lorentz Medal, Oersted Medal, Bavarian Maximilian Order for Science and Art, Matteucci Medal, Foreign Member of the Royal Society, honorary doctor of the University of Calcutta Education: University of Königsberg, Altstadt Gymnasium

Source: Wikipedia — https://en.wikipedia.org/wiki/Arnold_Sommerfeld