 In 1964 while at Boston University Sachs received an invitation from Paul Dirac to visit Cambridge University.Sachs, his wife and children first stayed for a one-month in Ireland, at the Dublin Institute for Advanced Studies where Sachs discuss various problems with Cornelius Lanczos, who had been one of Einstein's assistants in Berlin in the 1920s.Sachs also had discussions with Lanczos' colleagues John Lighton Synge, J. R. McConnell and Lochlainn O'Raifeartaigh.