Cremin was a lecturer at the University of Sydney from 1978 to 2000, where she taught archaeology and Celtic studies, and then was a casual lecturer in archaeology as Visiting Fellow at the Australian National University and University of Canberra teaching world history up to 2015. She has undertaken fieldwork in northern Portugal between 1988 and 1992 and Angkor, Cambodia from 2001 to 2015.[2]
Cremin's research covers landscape archaeology, especially in North Portugal (The Vinhais Survey) and in Australia's industrial heritage (mining and metallurgy), with a particular interest in boundaries and boundary crossings, and she has published numerous works including general texts in archaeology and Celtic Studies. She was the Australian representative on the industrial heritage body, TICCIH in the 1990s.[2]