He undertook doctoral studies in palaeoanthropology at the University of the Witwatersrand (Wits) in South Africa under Professor Phillip Tobias, focusing his research on the shoulder girdle of early hominins; he graduated in 1994. In 1991, he began his long term work at the Gladysvale site. This marked the same year that his team discovered the first early hominin remains from the site, making Gladysvale the first new early hominin site to be discovered in South Africa since 1948. In 1993, he was appointed to the position of research officer in the Paleo-Anthropology Research Unit (PARU) (now the Evolutionary Sciences Institute; ESI) at Wits.