In 1988 Da Silva was employed by the NSW Agricultural Department at the Trangie Research Agricultural Centre and from 1994 to 1997 worked at the Australian Cotton Research Institute in Narrabri.
Pada 1988 Da Silva dipekerjakan di Fakulats Pertanian NSW di Pusat Penelitian Pertanian Trangie dari 1994 hingga 1997 bekerja di Institut Penelitian Kapas Australia di Narrabri.