Eminent Harvard biologist Professor Matthew Meselson and Julian met in London in 1969, initiating 40-years of close collaboration and friendship. Here, Professor Meselson reflects on their work together, from co-organizing international meetings to support national and international policy processes, through joint research and publications, to co-founding the Harvard Sussex Program on CBW Arms and Arms Limitation. Describing the responses to a proposal to nominate the pair for a Nobel Peace Prize, the chapter emphasizes Julian’s natural inclination to shun public awards for his achievements.