Callaghan is past president of the Academy Council of the Royal Society of New Zealand and has published over 240 articles in scientific journals as well as a 1994 book, "Principles of Nuclear Magnetic Resonance Microscopy".
Callaghan is Past President of the Academy Council of the Royal Society of New Zealand. He has published around 240 articles in scientific journals as well as a 1994 book on magnetic resonance, "Principles of Nuclear Magnetic Resonance Microscopy".