He is a Fellow of the Institute of Mathematics and its Applications and a member of the Royal Society of New Zealand (RSNZ). He has more than 160 publications including three books on popular mathematics and science - Money Puzzles, Science Puzzles and Shape Puzzles, that have been, or are being, published in 11 countries. His book Counterexamples in Calculus (MAA) received Outstanding Academic Title award from the Choice Magazine of the American Library Association in 2010.