Caleb Warner (born September 12, 1922), son of Langdon Warner (Harvard professor who studied the Silk Road and was purportedly the model for Hollywood's Indiana Jones). Marine engineer and acoustical turnkey engineer, classical trumpeter, owner of the Instrument Guild. Designed (with Eric Herz) and produced the Baldwin Spinet Electric harpsichord which was used on The Beatles' "Because", and for the brief postlude on the Who's "Live at Leeds" album, and used by many others. Also designed and produced solid body rehearsal harpsichords and dulcimers. His harpsichords included examples with aluminium frames and electronic amplification.