Latest News:

Q&A with expert witness, Simon Braithwaite Meet our Interns in New York Data Centre Essentials: Design, Construction, and Operation of Data Centres for the Non-expert Diales host session at Berlin Dispute Resolution Days Diales collaborate to deliver another sculpture at the Goodwood Festival of Speed London Legal Walk 2023 We are delighted to release the third edition of the Diales Compendium Michelle McMillan is promoted to Director for Canada Combustibility & Liability – Who pays for the high rise fix? Diales welcomes a new Chief Financial Officer Driver Trett release their second Digital Digest Online Briefings | Cladding – The Implication For Valuation Meet and Greet Diales and EVRA in person Join our Technical support team in the Middle East Quantum Expert, Javier Sánchez Llopes, wins Client Choice Award Celebrating our first year in New York Get to know the new Regional Head of Diales in Oceania We are hiring in New York Diales Discusses – Virtual Hearings Diales staff are re-elected to the SCL Council Martin W. J. Smith, Diales Technical Expert, features in Big Project ME Diales launch new Middle East service: Arabic Litigation Support Diales welcomes Adrian Kong in Singapore Mark Wheeler, Head of Diales, to speak at the UK Adjudicators Conference Webinar: The role of Expert Witnesses in construction and engineering disputes Diales Technical collaborate with artist Gerry Judah, to create Drift. Diales open a new office in Madrid Diales announce collaboration with EVRA Consulting (PTY) Ltd (EVRA) Diales welcomes David Merritt to it’s team of experts Diales feature on Leaders League Diales open a new office in New York Diales Technical shortlisted in the British Construction Industry Awards 2020 Head of Diales, Mark Wheeler, is published in Lawyer Monthly. Chris Sunderland joins Diales as our Marketing and Business Development Director Diales Technical feature in photo contest Diales reception, 5th March 2020 COVID-19 UPDATE Diales Sponsor 8th ICC MENA Conference on International Arbitration Construction Claims Dubai – Record Keeping Evaluating Contract Claims, 3rd Edition – Out Now Diales are excited to sponsor the 17th ICC Miami Conference on International Arbitration Diales Sponsor the 7th Biennial Conference on Construction Projects from Conception to Completion How To Avoid Construction Disputes – Maria Fisentzou Diales nominated in Structural Awards 2019 Diales are delighted to announce that Phil Duggan been appointed as Head of Diales for the Middle East Diales are proud sponsors of Asia ADR Week 2019 Diales are pleased to be sponsoring the 5th ICC Asia Conference in Singapore Diales are pleased to be sponsoring the 4th ICC Africa Conference in Lagos this week Diales is proud to be sponsoring the 3rd PAW and to host a conference Diales is delighted to be taking part in the 3rd Kuwait Project Management Conference 2019. Diales is proud to be sponsoring the 7th ICC MENA Conference on International Arbitration Dealing with conflicting pressures – A practical guide Diales Technical are shortlisted for an award. Diales are proud sponsors of the CIArb’s International Arbitration Conference 2018 Flying high! Another Goodwood sculpture success Diales Host Drinks Reception GAR Live Construction Disputes ICC Institute Advanced Training on “Drafting enforceable awards” Should arbitration in investment protections treaties be forsaken? DRBF Conference – Paris, France Diales work with Gerry Judah on a new sculpture – Jacob’s Ladder Diales experts gain professional recognition Diales have two new experts Diales host successful drinks reception Diales are commended at the 2017 Structural Awards Mark Castell is attending the 2017 Dutch Arbitration Day, Amsterdam Independence Day: Why Do Many Experts Fail at Being ‘Independent’? John Mullen is published in the Construction Law Review Diales technical are shortlisted for two awards Diales celebrates five years of dedicated Expert Witness support services ICC 1st European International Arbitration Conference Diales are the lead sponsor of Kuala Lumpur International Arbitration Week

Expert Profile

David Wileman

David Wileman

Delay Expert

Planning and Delay Analysis
Oil & Gas
Process & Industrial
Asia Pacific
Middle East
United Kingdom


  • Planning Engineer
  • Over 25 years of industry experience
  • Specialist in varied methods of planning and delay analysis
  • Ongoing live project involvement
  • Appointed on many major international disputes


David is an experienced delay analyst who has provided expert witness reports and testimony on major cap-ex projects.

David acts as an expert in the fields of retrospective delay analysis, disruption, planning and programming, and scheduling but also continues to be involved with major live projects and undertakes project planning and control reviews on all types of projects.

David has been appointed an expert witness in relation to ship construction, process, oil and gas, water and waste treatment and building projects across the UK, Mainland Europe, Middle East, and Asia Pacific and provided commercial support in the USA.

David entered the industry as a technical apprentice, who trained and worked in various major engineering companies for 16 years. He acted as a planning and project controls engineer on some of the largest and most complex FPSO and fixed platform oil and gas projects.

His roles included the standardisation of systems and project control procedures, including the planning, monitoring, and control of major engineering projects, for power and oil and gas contracting organisations.

David moved into contract and commercial consultancy and established a reputation as an objective, experienced, and reliable expert witness on matters relating to retrospective delay analysis. He has experience of using a wide range of forensic planning techniques as an expert to establish, and demonstrate, critical delay and disruption.

Techniques used include the use of all forms of retrospective delay analyses and related histogrammes, S-curves, and other graphical outputs and reports, to assess the cause and effect of delaying events, entitlement to time and cost increases.

David advises and assists major blue chip engineering companies in claim defence and support, programme and schedule preparation, monitoring, updating and revision, retrospective analysis of delays and the preparation and presentation of delay claims.

This expert has the following cross-examination experience:

  • The Technology and Construction Court
  • High Court Action
  • International Arbitration
  • Adjudication/Mediation
  • Successfully completed external cross examination courses

This expert has been instructed by:

  • Baker & McKenzie LLP
  • Bond Dickinson LLP
  • Curtis David Garrard
  • Muckle LLP
  • Nordisk Legal Services
  • Norton Rose
  • Pinsent Masons
  • Rodyk & Davidson LLP
  • TeekensKarstens
 “I am pleased to advise that the above matter has been settled … As there is a confidentiality provision in the settlement agreement I cannot tell you the precise result although I do not think it will be overstepping the mark to say that [the Client] were wearing a broad smile. I think the settlement reached was in no small part all of your own efforts and I thank you for that.”