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Ben-Erik van Wyk is a professor of Botany at the University of Johannesburg with a research interest in systematic botany and plant utilisation. He is the author of international scientific bestsellers such as Medicinal Plants of the World. Gideon F. Smith is Chief Director for Biosystematics and Collections at the South African National Biodiversity Institute, professor of plant science at the University of Pretoria, and a research associate at the University of Coimbra in Portugal. He has authored or co-authored over 40 books, including on aloes, succulents, horticulture, gardens, Angola, taxonomy, and invasive plants.