John was a highly ethical and public-spirited scientist. He was a strong advocate for keeping the human genome free and publicly available, rather than be in the hands of private corporations. This advocacy has been of enormous benefit as we now enter the field of genomics and personalised medicine. He also contributed to many other social and ethical issues related to science. Finally, he was a much loved human being who was an inspiration and a role model for all who came in contact with him. He will be sorely missed."