Pieter Zeeman was a Dutch physicist who made significant contributions to the study of magnetic fields. Synonyms for his name include physicist, scientist, researcher, magnetism expert, and Nobel Prize laureate. Zeeman was awarded the Nobel Prize in Physics in 1902 for his discovery of the Zeeman effect, which involves the splitting of spectral lines in the presence of a magnetic field. Other words associated with Zeeman include magnetometer, laboratory, observatory, experiment, and spectroscope. He is often referred to as a pioneer in the study of magnetism, and his work on the Zeeman effect has had a major impact on modern physics and astronomy.