He was a senior lecturer/associate professor at Durham University and was director of their postgraduate programme in artefact conservation.
Involved in the excavation of archaeological sites since the age of 14, Caple graduated from Cardiff College of the University of Wales in 1979, with a Bachelor of Science degree in archaeological conservation.
[3] In 1986 he received a Ph.D. from the University of Bradford, for researching the composition and manufacturing of medieval copper alloy pins.
[3] Caple has authored two books: Conservation Skills: Judgement, Method and Decision Making in 2000,[5] and Objects: Reluctant Witnesses to the Past in 2006.
[9][10][11] A case study on the "re-reconstruction" of the Sutton Hoo helmet, which became an icon of Anglo-Saxon England after it was reconstructed by Herbert Maryon in the 1940s, yet was then reconstructed again by Nigel Williams in the 1970s, focuses on the concepts of reversibility and truthfulness.