There is an obituary for industrial psychologist John Karlin in the NY Times. His research team at Bell Labs was responsible for how telephones were designed around the capabilities of humans.
It is not so much that Mr. Karlin trained midcentury Americans how to use the telephone. It is, rather, that by studying the psychological capabilities and limitations of ordinary people, he trained the telephone, then a rapidly proliferating but still fairly novel technology, to assume optimal form for use by midcentury Americans.
Link to the article.