He was affectionately called Time Team's "lumps and bumps" man by Mick Aston, and works with the team alongside his day job, travelling the country surveying, recording and investigating archaeological sites. Regarding Time Team's potential return, which was realised in 2022 after an eight-year hiatus, Ainsworth said:
"Time Team has probably been one of the biggest things that has happened to archaeology for many years – to make archaeology and history accessible, and we need to keep that profile going whatever way we can."[3]
As of 2010, Ainsworth has been affiliated with the history and archaeology department at the University of Chester, where he is a visiting professor.[4]
He is president of the Friends of Epiacum (also called 'Whitley Castle')[5] the Roman fort on the southern edge of Northumberland, which he has surveyed and studied in depth.
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Wilkinson, David (15 April 2018). "A weekend master class with Time Team's Stewart Ainsworth". Activities / Epiacum. Epiacum Heritage (epiacumheritage.org) (blog). Bring the Past Alive. Imagine spending an entire weekend with Time Team's Stewart Ainsworth learning how to decode the landscape.