Mr. N. P. Høj is a safety expert with broad experience and special knowledge of design for safety, risk analysis, management, structural engineering, structural reliability and decision support. The special expertise on safety and risk analyses applied as an integrated part of the decision support has been applied in practice to support decision within design and operation of major infrastructure projects and as part of feasibility studies. Risk analyses have been carried out for a large number of tunnels, bridges and roads. Mr. Høj has contributed with his experience and developed new methods for safety design by participation in research projects. Analysis of concrete structures, and particularly tunnels, subjected to fire is part of Mr N. P. Høj's expertise. Furthermore, Mr N. P. Høj has a broad experience in design of tunnels, bridges etc.