Gareth Chalmers has used geochemistry, petrophysics, and sedimentology to investigate coal seam gas and shale reservoirs since 2002 at the University of British Columbia (UBC), Canada. He also worked at Shell to develop the Duvernay shale reservoir. Gareth currently lectures at the University of the Sunshine Coast and is researching Australian gas reservoirs. His MSc (Newcastle University) expanded sequence stratigraphy into coal-bearing strata by correlating surfaces using coal petrology. Gareth then completed his PhD at UBC, where he investigated shale and coal gas resources. Gareth is currently investigating the origin and distribution of toxic H2S gas within unconventional reservoirs.