The scientist known for their role in the development of the theory of relativity is Albert Einstein. His groundbreaking work, particularly the formulation of the special and general theories of relativity, revolutionized the understanding of space, time, and gravity. Einstein introduced concepts such as the equivalence of mass and energy and the bending of light by gravity. His theories have profoundly influenced modern physics and continue to shape contemporary discussions in cosmology and theoretical physics. Einstein’s contributions have made him a pivotal figure in scientific history.