David has worked in a change in the hardwood tree varieties grown, the commercialisation of new species, and the development of hardwood plantations in new regions in Queensland, South Africa, and Brazil. David currently focuses on plant breeding, disease tolerance, biomass, and wood property assessment and characterisation of Corymbia species and hybrids (spotted gums), Eucalyptus cloeziana (Gympie messmate), Backhousia citriodora (Lemon myrtle), Khaya senegalensis (African mahogany), Pinus species, Santalum lanceolatum (Northern Sandalwood), and Zingiber officinale (Edible ginger).