Pieter Zeeman (May 25, 1865 – October 9, 1943) was a physicist who shared the 1902 Nobel Prize in Physics with Hendrik Lorentz for his discovery of the Zeeman effect.
Born in Zonnemaire, Netherlands, Zeeman was a student of Lorentz at the University of Leiden. He began lecturing at Leiden in 1890. In 1896, at the request of Lorentz, he began investigating the effect of magnetic fields on a light source and discovered what is now known as the Zeeman effect. This discovery proved Lorentz's theory of electromagnetic radiation.
Zeeman was appointed professor of physics at the University of Amsterdam in 1900. In 1908 he became director of its Physical Institute.
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