William Arthur Stewart Buxton ... is known for being one of the pioneers in the human–computer interaction field. https://www.microsoft.com/buxtoncollection/type.aspx?t=Chord%20Keyboard chording keyboards from Bill Buxton's collection of unusual computer interface devices https://en.wikipedia.org/wiki/Bill_Buxton the photo shows Bill Buxton with a Microwriter chord input device his own web site: https://www.billbuxton.com/