Robert Green served for twenty years in the British Royal Navy from 1962-82. As a bombardier-navigator, he flew in Buccaneer nuclear strike aircraft with a target in Russia and then anti-submarine helicopters equipped with nuclear depth-bombs. On promotion to Commander in 1978, he worked in the Ministry of Defence before his final appointment as Staff Officer (Intelligence) to the Commander-in-Chief Fleet during the 1982 Falklands War.
Commander Green chaired the UK affiliate of the World Court Project (1991-2004), an international citizen campaign which led to the International Court of Justice judgment in 1996 that the threat or use of nuclear weapons would generally be illegal. From 1998-2002 he was Chair of the Strategic Planning Committee of the Middle Powers Initiative.
Having emigrated to New Zealand in 1999, he is the author of The Naked Nuclear Emperor: Debunking Nuclear Deterrence, and Fast Track to Zero Nuclear Weapons: The Middle Powers Initiative. A new edition of his 2010 book, Security without Nuclear Deterrence, was published in 2018 by Spokesman Books, with a major new Foreword by Vice Admiral Sir Jeremy Blackham KCB MA.