Dan Walls, a pioneer of quantum optics and especially the study of non-classical light, died in Auckland on 12 May 1999 after a battle with cancer, at the age of 57 years. Dan Walls completed a PhD with Roy Glauber at Harvard in 1969 and joined the University of Waikato in 1972. Together with his colleague Crispin Gardiner, during the next 25 years he established a major research centre for theoretical quantum optics in New Zealand and built active and productive collaborations with groups throughout the world.
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