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- Clark Adams (1969–2007) was former president of the Humanist Association of Las Vegas and Southern Nevada, and a life member of the American Humanist Association.
- Steve Allen was a Humanist Laureate in The International Academy of Humanism, and Chairman of the Council for Secular Humanism.
- Nayef Al-Rodhan is a philosopher, neuroscientist and geostrategist. Author of Sustainable History and the Dignity of Man; Emotional Amoral Egoism and Symbiotic Realism.
- Isaac Asimov was a Humanist Laureate in the International Academy of Humanism.
- Michael Atiyah, British mathematician.
- Margaret Atwood is a Humanist Laureate in the International Academy of Humanism.
- A. J. Ayer was a Humanist Laureate in the International Academy of Humanism.
Read more about this topic: List Of Humanists