After gaining a BA in History, MA in the History of Wales and PhD at Aberystwyth University, Dr Rees joined the School of History and Archaeology as Lecturer in Modern History. She completed her Postgraduate Certificate in Higher Education at Bangor University, and is a Fellow of the Higher Education Academy. Dr Rees is editor of the Transactions of the Anglesey Antiquarian Society and Field Club.
Her main research areas focus on eighteenth- and nineteenth-century Wales, in particular the landed elite and their country estates, social mobility, rural society and protest movements. She is currently researching the link between Wales and the East India Company, focusing on instances of Company men purchasing landed estates in Wales.