John Flynn graduated from Trinity College, Dublin in 1990 with an honors degree in Physics and Mathematics and joined EDS Group, the international IT services company, in the UK.

While at EDS, he had responsibility for project management consultancy of computer-systems development projects and other technology-related consultancy, working in the UK, Germany, and the US. He obtained an MBA from Trinity College, Dublin in 1996 and joined ACT Venture Capital in October, 1996.