As phytomycologist I focus on the systematics and evolution of plant pathogenic fungi, especially the Dothideomycetes (Mycosphaerella, Botryosphaeria, Phoma, Cladosporium and aggregate genera). The aim of my research is to understand speciation, host specificity, and the effects of sexual recombination on these aspects. The main thrust of this research is to characterise plant pathogenic fungi on various host plants and substrates, to determine the various phases of their life cycles, to harness DNA, ecological, cultural and morphological data sets to characterise the genetic variation in populations, and to use this information to elucidate their epidemiology. I obtained my B.Sc. in Forestry (1985) and M.Sc.Agric. in plant pathology (1988) at the University of Stellenbosch (South Africa), and Ph.D.(Agric.) in plant pathology (1992) at the University of the Orange Free State (Bloemfontein, South Africa), and DSc in fungal systematics (2009) at the University of Pretoria (Pretoria, South Africa). I joined the CBS-KNAW Fungal Biodiversity Centre (Utrecht, Netherlands) in 2002. Seehttp://www.cbs.knaw.nl for more information.