Jonathan currently works at the School of Biological, Earth and Environmental Sciences (BEES) , University of New South Wales, Sydney. Jonathan does research in Dendrochronology and Paleoclimatology. One current focus is the spatial field reconstruction of climate modes in Australasia. Another key area of interest are subfossil logs of kauri (Agathis australis) from northern New Zealand for radiocarbon calibration and palaeoclimate study.