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John Haldane
Professor of Philosophy at the University of St Andrews, Director of the Centre for Ethics, Philosophy and Public Affairs and an Executive Council member of the Royal Institute of Philosophy. Author of several books including Philosophy, Truth and Meaning and
Mind, Metaphysics and Value and co-author of Atheism and Theism in the Blackwell Great Debates in Philosophy series.

Stephen Hawking
Lucasian Professor of Mathematics at Cambridge University. He has worked in general relativity with a special focus on black holes, cosmology and quantum gravity. His A Brief History of Time was one of the most popular scientific books of the 20th century.

Georg W.F. Hegel
Hegel (1770-1831) was one of the most influential of the German philosophers. Among his many disciples was Karl Marx. His works include The Phenomenology of Mind, The Science of Logic and Lectures on the Philosophy of History. Hegel was an absolute Idealist who held that only the collective Mind is real and all finite minds are part of this Mind.

Werner Heisenberg
Heisenberg (1901-76) is one of the pioneers of quantum theory. He is best known for both his Uncertainty Principle, the notion that an observer cannot know with certainty both the position and the momentum of a subatomic particle since any measurement will require light to hit and thereby disturb the particle, and matrix mechanics, a system he developed to describe the behavior of quantum particles.

Paul d'Holbach
Baron Paul d'Holbach (1723-1789) claimed in his Systeme de la Nature that matter and motion permanently constitute the totality of the universe. In his view, human beings were machines and their mental life could be reduced to sensations.

Gerard Manley Hopkins
(1844-1889) One of the greatest English poets of the 19th century whose poetry became widely known only in the next century. Hopkins, a Jesuit priest, was deeply influenced by the philosophy of John Duns Scotus.

Fred Hoyle
Plumian Professor of Astronomy and Experimental Philosophy at Cambridge University and then first director of the Institute of Theoretical Astronomy at Cambridge. A leading critic of Big Bang cosmology, he proposed the Steady State theory which calls for continuous matter creation. His works include The Nature of the Universe.

David Hume
(1711-76) The most influential of the British empiricists. His Enquiry Concerning Human Understanding and Dialogues Concerning Natural Religion set forth his skeptical approach to human knowledge and religious belief. He denied the existence of a self, rejected arguments for God's existence and claims of miracles and held that morality is based on feeling.

Thomas Huxley
Early advocate of Darwin's evolutionary ideas. He thought of evolutionary principles as true causes and, like Darwin, was agnostic on the question of God's causal action in the world.