The scientist known for their groundbreaking work in the field of electromagnetism is James Clerk Maxwell. Maxwell formulated the comprehensive set of equations, now called Maxwell's Equations, which describe how electric and magnetic fields interact. His work laid the foundation for modern physics, particularly in understanding electromagnetic waves and light. Maxwell's theories significantly advanced fields such as optics, telecommunications, and electrical engineering. His contributions not only revolutionized theoretical physics but also enabled numerous technological advancements, influencing the development of contemporary science.