 During this time, in Europe she was further trained in the field of archaeozoology under Angela von den Driesch of the University of Munich, Germany and Anneke Claassen of the University of Groningen, Netherlands.The Transvaal Museum, which initially in 1975 had only a small skeletal collection mostly of skulls and skins, was substantially expanded with the joint efforts of Voigt and Plug.The museum now boasts of the most extensive skeletal collections in Africa (South Africa, Lesotho, Swaziland, Mozambique, Zimbabwe, Botswana, Namibia, Malawi and Zambia) comprising the "full spectrum of the diverse fauna of southern Africa" which covered Stone Age, Iron Age and the historical period.