After starting up his own light company, Tesla got 30 patents, and he was invited to present in front of the American Institute of Electrical engineers. There, Tesla's lecture caught the attention of George Westinghouse. Westinghouse was an American entrepreneur and engineer. Westinghouse invented the first AC power system, and Thomas Edison was Westinghouse's main competitor in the "Battle of the Currents". Westinghouse later hired Tesla to keep working on his research on AC power units..