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David Valles Valles, MS, BS (Hons)

J.S. Held Releases Insights on Risks & Opportunities Expected to Impact Organizations in 2025

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David is a civil engineer with expertise in planning, delay analysis, and project control disciplines for capital infrastructure projects. He has diverse project experience across multiple disciplines, sectors, and regions, including key delivery roles for a major international Spanish contractor, working on key international projects.

David’s current focus is on delay analysis, claims preparation, and expert witness services. Prior to joining J.S. Held, David was a planning engineer on a Public-Private Partnership infrastructure project in the United States, with an estimated value of $1.2B US. He has also provided schedule monitoring and project management assistance for capital projects throughout EMEA, North America, LATAM, and ASEAN regions.

David has also been fully funded by a merit award as a researcher at the University of Colorado-Boulder, where he developed a quantitative risk-based approach on flexible pavements under flooding conditions. The American Society of Civil Engineers (ASCE) later published the research in the Journal of Infrastructure Systems.

Earlier in his career, David worked as a structural engineer for several EPC capital projects and as a field engineer for a main contractor. These roles provided detailed first-hand knowledge and experience of design and construction activities on major infrastructure projects.

David has undertaken complex delay analyses on live projects to develop and defend extension-of-time claims, including for major infrastructure schemes in the US. For J.S. Held, David has assisted delay experts with the analysis of complex disputes, including international ICC and EDF arbitrations, SIAC arbitrations, adjudications, and extensions of time assessment under JCT and NEC4 contracts.

David is a Consultant at J.S. Held, based in London, working on projects across the EMEA regions. His experience in delivering major civil engineering projects is utilized to provide expert witness services on matters of delay and construction advisory services in project planning and scheduling disciplines.

David is fluent in English, Spanish, and Catalan. He received a Master of Science in Civil Engineering with a major in Structural and Construction Engineering and a Bachelor of Science in Civil Engineering from the Polytechnic University of Catalonia (UPC) in Spain. 

Key Expertise

  • Construction Planning & Scheduling
  • Forensic Delay Analysis
  • Contract & Commercial Management
  • ‘Extension of Time’ Claims Preparation & Defence