Gerhard van der Horst – graduated from the University of Port Elizabeth/NMMU – PhD in Zoology and University of Stellenbosch – PhD in Human and Animal Physiology in South Africa. Founder member of the “Andrology Workshop” and later the Reproductive Biology Society of South Africa. Gerhard van der Horst served two terms as the President of the Physiology Society of South Africa. The author is currently an Emeritus Professor of Physiology at the University of the Western Cape, an Extra-Ordinary Professor of Physiology, Division of Medical Physiology, University of Stellenbosch. He is a research associate at the National Zoological Gardens inPretoria and Senior consultant to Microptic SL, Spain, involved in new developments in Computer-Aided Sperm Analysis (CASA). Th Professor is a National Research Foundation (NRF)-rated scientist and published more than 140 research articles and 250 conference presentations. His main research interest is comparative spermatology, CASA (from invertebrates to vertebrates including primates) and sperm competition. He is an Associate Editor, Reproduction in Domestic Animals