calculations for an expedition from the surface of the Earth to the surface of the planet Mars appeared at the end of Heim's progress report. In November 1957, Heim delivered a lecture about his propulsion theory to the Deutschen Gesellschaft für Raketentechnik und Raumfahrt (German Society for Rocket Technology and Space Travel), Frankfurt. Subsequently, Wernher von Braun sought his comments on various aerospace projects. According to von Ludwiger, an audiotape of Heim's presentation had been prepared for shipment to America. In 1959, Heim completed his first publication in the German journal Zeitschrift für Flugkörper (Magazine for Missiles), Heim discussed "the principle of the dynamic Kontrabarie" in which he examined how a field drive would be more effective than the best chemical drive for rockets. These papers remained ambiguous on the fundamental concepts underlying his theory of the field drive, likely due to the necessity to complete the calculations on the extra fields of his field theory. These calculations were not performed until a few years later. Heim stopped work on the propulsion aspect of his theory in 1959. Subsequently, the remainder of his life was devoted to refining the unified field attributes of his theory. 1960s In the late 1950s and early 1960s there were a number of reports on Heim in magazines and tabloids such as Le Figaro, Bunte Illustrierte, Quick and Stern. The magazine le Figaro remarked, on 15 January 1969, that he was an "inhuman robot". The German television station ARD ran reports and interviews with Heim. It was speculated that Heim was likely to make a breakthrough, either in fundamental physics or propulsion theory. On 17 November 1969 Heim reported the progress he had made towards developing his unified field theory to Messerschmitt-Bölkow-Blohm (MBB). Pascual Jordan and Gebhard Lyra were among the small body of scientists who attended that colloquium. Jordan wrote Heim a letter on 22 December 1969 encouraging him to publish his theory. 1970s Ludwig Bölkow encouraged Heim to enhance his theory. On 25 November 1976 Heim publicly introduced, for the first time, his completed unified field theory in a presentation to MBB engineers. It included the methodology for calculating the mass spectrum of elementary particles. Pursuant to recommendations by Werner Heisenberg's successor, Hans-Peter Dürr, Heim published his unified field theory summary, the following year, in an article entitled Recommendations of a Way to a Unified Description of Elementary Particles in the Max Planck