The famous scientist known for their work in electromagnetism is James Clerk Maxwell. Born in 1831 in Scotland, Maxwell is best known for formulating the classical theory of electromagnetic radiation, which brought together electricity, magnetism, and light as manifestations of the same phenomenon. His most significant achievement is the set of equations, now known as Maxwell's equations, which describe how electric and magnetic fields interact and propagate through space. Maxwell's contributions laid the groundwork for modern physics, influencing future developments in numerous fields, including quantum mechanics and relativity, making him a pivotal figure in the history of science.