Nikola Tesla was a PHYSICIST, inventor, and electrical engineer who made groundbreaking contributions to the development of electricity and radio. He is best known for his work on alternating current (AC) electricity supply systems. Tesla's inventions revolutionized the way electricity is used and distributed around the world. He was also a pioneer in the field of robotics and remote control technology. Tesla's name is often associated with the term 'PHYSICIST' due to his numerous accomplishments in the field.