Most Notable achievement: Classical theory of Electromagnetic Radiation.
He calculated that the speed of propagation of the electromagnetic wave is approximately equal to the speed of light.
His Discoveries are the foundation of fields like Modern Electrical Engineering, Special Relativity, and Quantum Mechanics.
He is also regarded as a founder of the modern field of electrical engineering.
Reference Source:
[1] Wikipedia Contributors. “James Clerk Maxwell.” Wikipedia, Wikimedia Foundation, 20 Oct. 2021, en.wikipedia.org/wiki/James_Clerk_Maxwell. Accessed 5 Nov. 2021.