Ian A.G. Shepherd was Regional Archaeologist for Grampian Regional Council, where his involvement with ancient monuments included both surface fieldwork and excavation of sites as widely separated in time as Bronze Age burials and Fyvie Castle. His principal excavation, with his wife Alexandra, was at Covesea Cave in Moray, in use from Late Bronze Age to Pictish times.
He was passionate about Scotland's archaeology, playing a central role in leaving it much healthier than in the 1970s. He was the first chair of the Association of Regional and Islands Archaeologists.
With well over 60 significant publications to his name, he produced a huge range of literature: from leaflets and guide-books to specialist studies (particularly on Beaker burials and Bronze Age artefacts), but also including regional archaeological overviews and monographs on architecture. Two of his three general surveys have been republished: his Exploring Scotland's Heritage: Grampian (1986) as Aberdeen and North-East Scotland (1996); and Gordon: An Illustrated Architectural Guide (1994) as Aberdeenshire: Donside and Strathbogie (2006).