- 1987 BSc (cum laude), University of Natal, Physics and Applied Maths
- 1988 BSc (Hons, 1st class), University of Natal, Physics
- 1992 MSc, University of Natal, Physics
- 1994 PhD, University of Natal, Physics
Greg has been Adjunct Professor at the Climate Change Research Institute since October 2009. Greg is Director of Bodeker Scientific, a private research company currently employing 4 people, and specialising in stratospheric processes and their role in climate. Greg had previously worked for NIWA from May 1994 to August 2009. He is currently co-chair of SPARC (Stratospheric Processes And their Role in Climate) one of four core projects of the World Climate Research Programme. He is also co-chair of GRUAN (the GCOS Reference Upper Air Network) a state-of-the-art network initiated as a core part of the Global Climate Observing System (GCOS) for monitoring long-term changes in the climate of the whole atmosphere. Greg has also contributed as a coordinating lead author to WMO/UNEP ozone assessments.
- Detection and attribution of changes in climate of the troposphere and stratosphere.
- Analysis of measurements of atmospheric composition
- Statistical modelling of trends and variability in climate variables