<p>In 1971, Paul Berg asked Francis Crick about his views on a controversial proposed experiment involving recombinant DNA; to Berg’s surprise, Crick had no comment to make. This article first describes the multiple reasons why Crick did not respond to Berg, including psychological factors that affected Crick at the time, the limits of his unstated reflexively positivist approach to social issues, and his reluctance to pursue social or political issues when challenged. Crick’s lack of involvement in discussions about recombinant DNA, including in the Asilomar process, is then used to explore two other notable absences from Asilomar: the immunologist Niels Jerne, who was invited to be on the organizing committee but was not involved for reasons that are unclear; and molecular biologist and biological weapons campaigner Matthew Meselson, whose presence would have added a layer of understanding to the discussions, particularly regarding the threat of bioweapons. These enigmatic absences raise questions about the representativeness of Asilomar and suggest future investigations as to how the legacy of Asilomar was shaped both by those who were present–and by those who were not.</p>