Harold Trevor Clifford, commonly known as Trevor Clifford, was a botanist and taxonomist born on 18 April 1927. After completing his DSc (University of Melbourne) and PhD (University of Durham, England) he spent time in England before travelling to Nigeria, where he taught agriculture for three years.

On his return to Australia, Trevor Clifford lived and worked in Queensland, teaching botany at the University of Queensland for thirty-four years, and Professor Emeritus was conferred on him on retirement. He went on to become a Research Associate attached to the Geology section of the Queensland Museum, focussing on the study of their fossil plant collection.

Trevor Clifford is an important figure in Australian botany and, in later life, geology, with around thirty books and two hundred research papers to his name. In addition to the records outlined in this guide, archives of his papers are also held by the Hunt Institute for Botanical Documentation, and at the Basser Library (Australian Academy of Science).