Lorentz's first achievement was in his doctoral thesis when he refined [[James Maxwell|Maxwell]]'s electromagnetic theory in his doctoral thesis. In 1878, he became professor of mathematical [[physics]] at Leiden University. Later he moved to the Teyler Institute, Harlem. | Lorentz's first achievement was in his doctoral thesis when he refined [[James Maxwell|Maxwell]]'s electromagnetic theory in his doctoral thesis. In 1878, he became professor of mathematical [[physics]] at Leiden University. Later he moved to the Teyler Institute, Harlem. |