John Harper (born 11 November 1937) is a retired computer engineer.
He led a Computer Conservation Society/Bletchley Park team that rebuilt a working World War II electromechanical Bombe decryption device.
John Harper, from 1995 to 2006, led a Computer Conservation Society team rebuilding a working World War II Bombe decryption device.
On 6 September 2006, John Harper and the rebuild team first demonstrated the working Bombe in action.
[3] On 24 March 2009 at Bletchley Park, John Harper was presented[4] with the 49th Engineering Heritage Award by the Institution of Mechanical Engineers awarded to the BCS Computer Conversation Society for the conservation and restoration of the Bombe.