Martin Weaver was an internationally recognised expert on the conservation of buildings and other heritage items ranging from steam locomotives to U-boats. Trained as an architect in London, Martin began working on archaeological sites in Britain and the Middle East and developed a life-long interest in the science of materials and their conservation. He moved to Canada eventually running an international consultancy from his home base of Ottawa while also teaching in the Historic Preservation Program at New York’s Columbia University. In between he found time to write a standard text: “Conserving Buildings”, now in its second edition. He was a member of both US ICOMOS and ICOMOS Canada and a former president of the Association for Preservation Technology. Many will remember Martin for his energy, enthusiasm and inspiration conveyed at seminars and training programs around the world, including Adelaide in 1988 on building stone. He was a major part of the biennial International Course on Wood Conservation Technology held in Norway, contributing on every occasion since its inception in 1984, and missing only the most recent course this year when prevented by his declining health. To conservation practice world-wide, he made a huge contribution.