The term ALTERNATING CURRENT PIONEER refers to the work of Nikola Tesla, an inventor and engineer who made significant contributions to the development of alternating current (AC) electricity. Tesla is often credited with inventing the first alternating current motor and transformer, as well as the INVERTER, a device that converts direct current (DC) into AC. He also developed the RECTIFIER, a device that converts AC into DC, and the SINUSOIDAL waveform, which is a type of AC waveform.