Tribe joined the University of Queensland's Faculty of Medicine (where he edited the University medical society's journal Trephine), but found that he did not enjoy hospital work and left. It was not long after this that he left Australia for Britain, where he worked at various times as a sketch artist, public relations officer, journalist and lecturer.
In Britain, Tribe was chair of Humanist Group Action (1961-1964), President of the National Secular Society (1963–1971), editor of The Freethinker (1966). He was also an executive committee member of the National Council for Civil Liberties (1961–1972).
Since returning to Australia, he has continued to work for the secularist and humanist movement, but has not held office in any organisation.
In 2001, Tribe became an honorary associate of Rationalist International.
- Tribe, David (1971). The open society and its friends. Foreword by Philip Hinchcliff. London: National Secular Society.
- Freethought and Humanism in Shakespeare (1964). London: Pioneer Press.
- Religion and Ethics in Schools (1965). London: National Secular Society.
- Why are We Here? (a poem) (1965). London: Outposts Publications.
- 100 Years of Freethought (1967). London: Elek Books.
- Humanism, Christianity, and Sex (1968). London: National Secular Society.
- The Cost of Church Schools (1970). London: National Secular Society.
- President Charles Bradlaugh, MP (1971). London: Elek Books. ISBN 0-236-17726-5
- Nucleoethics: Ethics in Modern Society (1972). London: MacGibbon and Kee. ISBN 0-261-63266-3
- Broadcasting, Brainwashing, Conditioning (1972). London: National Secular Society. ISBN 0-903752-01-8
- Questions of Censorship (1973). London: Allen & Unwin. ISBN 0-04-701007-X
- The Rise of the Mediocracy (1975). London: Allen & Unwin. ISBN 0-04-300057-6
- Words and Ideas (2009). Sydney: Humanist Society of NSW. ISBN 978-0-9807165-0-4
Essays and columns
- Tribe, David (Mar 2012). "Why the net is over-rated". Backburn. Australian Author. 44 (1): 21.
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