Sidney Darlington (1906–1997) was an American electrical engineer known for the Darlington circuit, chirped radar technology, and much more.
In August 1970, 55 years ago, he first proposed the use of the Discrete Fourier Transform (DFT) for multicarrier modulation/demodulation-central to the later important OFDM method. This method was implemented in the early 1970s and found widespread use in today's Wi-Fi, DVB, 4G, and other applications.