The idea of launching objects into space using cannons is as old as modern physics itself. As guided missile technology was not yet advanced enough for this purpose, Bull wondered whether the job could be done using guns. And shortly after leaving HARP, Bull also accepted a professorship from Dr. Donald Mordell, Dean of Engineering at McGill University. Furthermore, the HARP launch system competed directly with the new Black Brant sounding rocket developed by CARDE. But the dream of orbital gun launch lived on.