John E. Karlin, Human Factors Pioneer, Dies at 94

John E. Karlin was instrumental in shaping the telephone as we know it:

An early experiment involved the telephone cord. In the postwar years, the copper used inside the cords remained scarce. Telephone company executives wondered whether the standard cord, then about three feet long, might be shortened. Mr. Karlin’s staff stole into colleagues’ offices every three days and covertly shortened their phone cords, an inch at time. No one noticed, they found, until the cords had lost an entire foot.

John E. Karlin, Who Led the Way to All-Digit Dialing, Dies at 94 –

See also: From rotary to Siri: How the phone numbering system came and went