Lynda K. Skipper is a senior lecturer in conservation at the University of Lincoln, UK, focusing on science, research, and preventive conservation. She has a PGCE in higher education teaching and is a Fellow of the Higher Education Academy. She researches historic interiors and stone biodeterioration. Philip J. A. Skipper is a research associate and associate lecturer at the University of Lincoln. He also works as a freelance consultant, currently contracted with Historic England to provide advice and carry out research projects on biological growth, biodeterioration of heritage materials, surface treatments, and general heritage science.