Book excerpt: During the last thirty years, biophysicist and philosopher Henri Atlan has been a major voice in contemporary European philosophical and bio-ethical debates. In a massive oeuvre that ranges from biology and neural network theory to Spinoza's thought and the history of philosophy, and from artificial intelligence and information theory to Jewish mysticism and to contemporary medical ethics, Atlan has come to offer an exceptionally powerful philosophical argumentation that is as hostile to scientism as it is attentive to biology's conceptual and experimental rigor, as careful with concepts of rationality as it is committed to rethinking the human place in a radically determined yet forever changing world. --Book Jacket.