The title "Father of AC" (alternating current) is commonly attributed to **Nikola Tesla**. Tesla was a pioneering inventor and engineer whose work with AC power systems revolutionized electrical engineering. His development of the AC induction motor and transformer, along with his contributions to the AC power distribution system, played a crucial role in the adoption and widespread use of alternating current for electric power transmission.
Tesla's AC system was successfully demonstrated in the "War of Currents" against Thomas Edison's direct current (DC) system, leading to AC becoming the dominant method for electrical power distribution.