Tom Oberheim is a highly influential American audio and electronics engineer celebrated for his pioneering designs of analog synthesizers, sequencers, and drum machines. Renowned for the powerful, warm, and "fat" sound of his instruments, particularly the iconic OB-X series, Four-Voice, and Eight-Voice synthesizers, Oberheim was instrumental in popularizing polyphonic synthesis. His innovative Synthesizer Expander Module (SEM) architecture and early programmable digital sequencers like the DSX, along with the distinctive-sounding DMX and DX drum machines, significantly shaped the sound of popular music, especially in the 1980s. A key figure in the development of MIDI, Oberheim's contributions have left an indelible mark on music technology, and his legacy continues with the recent revival of the Oberheim brand, solidifying his status as a true visionary in the field.