Mark Christmas joined William J Marshall & Partners as a scientist in 2006 and has worked on a range of structural and civil engineering projects in the United Kingdom and overseas. He is experienced in surveying building defects and on-site testing. His interests and experience include tree-root-related subsidence, water penetration through flat and green roofs, defects in surface coatings, deterioration of reinforced concrete marine structures, defects in sub-surface drainage systems, defects in concrete structures, defects in masonry and steel framed buildings, document control processes and contract administration.

Mark produces working drawings, reports and presentation illustrations and has been responsible for the production of civil working drawings for large projects including civil engineering drainage and paving schemes for major shopping centres and PFI hospitals.