He took up various teaching posts in the UK before moving to Australia as Head of Mathematics at the
University of Southern Queensland in
Toowoomba. He then returned to England to lecture at
Sunderland University and worked in lecturing and research posts at a number of UK universities. In 1990 he joined the
City University of Hong Kong Department of Mathematics. Similar with his academic career, Professor Caldwell worked for a number of large organizations including the role as Head of Modelling with
Unilever Research UK. Through his research work, he has published hundreds of journal research papers and conference papers, and more than a dozen textbooks and theses. As a result of scientific publications, he has had extensive experience in editorial work involving mathematics. Furthermore, he has had extensive experience of course development work in mathematics at a number of universities in the UK and overseas. On retirement he continued at City University of Hong Kong up to 2010 and was adjunct professor in the Department of Mathematics until 2012. More recently he formed strong links with the
Open University of Hong Kong. Professor Caldwell had extensive experience of
mathematical modelling throughout his career in both university teaching and industry and was instructor for a team of three Hong Kong mathematics undergraduate students, who won the first place award, Meritorious, in the 2000 Netease Cup China Undergraduate Mathematical Contest in Modelling (CUMCM). Caldwell authored a number of postgraduate textbooks in mathematical modeling and edited a number of annual conference proceedings linked to POLYMODEL (i.e. North East Polytechnics Mathematical Modelling & Computer Simulation Group). Professor Caldwell was invited by the Open University of Hong Kong (OUHK) to take on the role of Honorary Professor (Mathematics & Statistics) for the period 2013–2019. Also Professor Caldwell has been awarded Honorary Doctorate in Professional Achievement by
Teesside University in 2014. On 27 July 2024, he died peacefully and surrounded by family in Hong Kong at Queen Elizabeth Hospital due to complications arising from
prostate cancer. ==References==