Thereafter he became Curator of Vertebrates at the Western Australian Museum from 1958 to 1963 .
He was an assistant at the department birds of the Rijksmuseum van Natuurlijke Historie in Leiden from May 1955 to June 1957 .
Thereafter assistant became Curator of Vertebrates at the Western Australian Museum from 1958 to 1963 .
He was an assistant at the department birds of the Rijksmuseum van Natuurlijke Historie in Leiden from May 1955 to June 1957 .