Jürgen Moser

Jürgen Kurt Moser or Juergen Kurt Moser (July 4, 1928, Königsberg, East Prussia – 17 December 1999, Zürich, Switzerland) was a German-American mathematician who worked in differential equations, spectral theory, celestial mechanics, and stability theory, with groundbreaking contributions in dynamical systems. He received his Ph.D. from the University of Göttingen in 1952, studying under Franz Rellich and Carl Siegel. He emigrated to the United States in 1953.