Murray was Professor of Chemistry at the University of Canterbury in Christchurch until 2010. His research interests were centred on selected ion flow tube mass spectrometry (SIFT-MS) and he developed strong research links with colleagues at the Jet Propulsion Laboratory in Pasadena, CA, USA investigating ion molecule chemistry of interstellar and planetary atmospheres.
When the University of Canterbury commercialized the technology with the formation of Syft Technologies Ltd in 2002, Murray served as Chief Technology Officer of the new company.
Since then he has been heavily involved with the transformation of the large laboratory based instrument into the small, sophisticated Voice instruments that are available today. He has continued with ion-molecule chemistry, method development, environmental applications and negative reagent ions.