William A Cook

William A Cook (Bill) is a registered civil engineer with over 40 years of program, project, construction and operations management experience. He employs his skills to forensically analyse claims and resolve disputes and has prepared or provided expert analyses on hundreds of appointments.

William Cook is a highly skilled expert with 40 years of experience in the construction industry, recognised for his first-rate testimony in high-value disputes. His extensive background in project management and claims resolution makes him a sought-after authority in the field.

Lexology Index – Consulting – Construction – Quantum Delay and Technical

Bill’s experience includes programme, project, construction and operations management and post-construction claims resolution, with hands-on project experience including a US$850 million waste-water facility programme and a US$700 million rail line. Bill’s expertise spans a broad variety of project types including airports, casinos, concert halls, courthouses, education, highways, hospitals, hotels, industrial, libraries, office buildings, parking structures, sports stadiums, theme parks and transportation facilities. He was also a construction management specialist to FEMA’s Public Assistance group in the aftermath of Hurricane Katrina.

Bill has testified in a variety of dispute resolution forums including jury trials, arbitrations and mediations. He has testified and analyzed claims involving the areas of schedule and delay analysis, construction management standard of care, costs audits and impacts, contractor performance, extra work, contractor defects, errors and omissions and damages.  Case size has ranged from less than US$1 million to more than US$100 million.

Bill is a professional engineer in California. He earned a BS in civil engineering from Rutgers University College of Engineering and is a past member of the board of directors of the Construction Management Association of America, as well as a past Los Angeles chapter president. He has presented seminars to the LA County Bar Association and to many other trade associations and conferences on a variety of subjects from reading plans and structural engineering to scheduling and claims analysis.

William A Cook is a highly-respected expert in his field and is praised for his “vast industry awareness” and “intelligent and intuitive approach” to matters.

William has tremendous experience as a construction expert. His technical skills are outstanding.

Mark Dixon

Mark Dixon is a dual-qualified Chartered Surveyor and Chartered Arbitrator with 40 years’ experience in engineering and construction, and is a respected international quantum expert witness and dispute resolver.

Mark is an excellent expert whom I recommend highly. He finds key quantum issues and gets his opinions across concisely.

Lexology Index – Construction – Thought Leader

Mark first testified as an expert witness in court in 1995. He has given oral testimony in the English courts (including the TCC) and in various international arbitration proceedings, by traditional cross-examination and concurrent expert conferencing. His expert commissions have included disputes up to US$1.2 billion on contracts up to US$2.5 billion, within wider projects up to US$17 billion in value.

Mark specialises in major oil and gas, marine, industrial, power and utilities sector projects and has been appointed as expert on offshore and onshore oil and gas facilities in Asia, Australia, Europe and the Middle East; shipbuilding contracts in Europe and Asia; and power, utilities and process plant projects in Europe. He has also been appointed on various infrastructure and building construction projects in Europe.

Mark is also an experienced third party neutral. He has been appointed as adjudicator or arbitrator on over 500 cases. He holds the CIArb’s Arbitration and Adjudication Panel Practice Certificates and is on adjudication panels of the RICS, ICE, CIArb, TeCSA, RIBA, AICA, CIC and CLG, and arbitration panels or lists of the RICS, CIArb, ICC, LCIA, HKIAC, AIAC, CIETAC, SHIAC, SCIA, LMAA (Supporting Member) and PIAC.

Mark’s expert and dispute resolution practice is underpinned by experience in estimating, tendering, project surveying, contract administration, commercial project and contract management, delay analysis, and claims consultancy.  He has been involved in contracts up to US$11 billion on projects valued up to US$30 billion.

Mark Dixon ranks amongst the best players in our construction quantum and delay experts research, maintaining a reputation as “an amazing expert” for his extensive experience across high-value construction disputes.

John Jones

John Jones is a Chartered Quantity Surveyor with over 20 years of construction and engineering industry experience. He has a background of working for both subcontractors and main contractors and has acted as an independent quantum expert on more than 35 occasions.

John Jones is a prominent expert who is routinely appointed in major dispute resolution proceedings thanks to his expertise in quantum analysis during construction and engineering projects.

Lexology Index – Consulting – Construction – Quantum Delay and Technical

John has significant experience in the preparation of expert reports and has been engaged as single and joint party appointed expert by instructing solicitors to produce expert witness reports on quantum matters in UK litigation, arbitration and adjudication. He is a practising member of the Academy of Experts, a fellow of the Royal Institution of Chartered Surveyors and a member of the Chartered Institute of Arbitrators. He holds a master of laws degree in construction law and an Edexcel Advanced Professional Award in Expert Witness Evidence (LETAPAEWE).

John specialises in final account preparation, claims management, dispute avoidance and dispute resolution. He is regularly appointed to prepare or independently assess claims for disruption and prolongation.

John’s industry experience includes major civil engineering and highway works, rail infrastructure projects, oil and gas, industrial and process plants, health facilities and power generation projects. He has managed commercial teams on large-scale projects and has a wide breadth of contractual experience ranging from FIDIC, GC/Works, ICE, IChemE, JCT and NEC3/4 to various bespoke PFI and PPP forms.

John is very user-friendly and pragmatic. He communicates well with lawyers, clients and other experts.

Ekrem Kaya

Ekrem Kaya is a widely experienced civil engineer with over 25 years of construction industry experience. He has acted as expert witness in matters of delay and quantum.

Ekrem is one of the best quantum experts in international arbitration. He can work at a fast pace

Lexology Index – Arbitration

Ekrem has been appointed as expert witness on numerous occasions and has been cross-examined twice, including giving concurrent evidence (‘hot tubbing’). He has experience in complex international construction disputes, including two major investment treaty (ICSID) arbitrations, and has been appointed as a dispute adjudication board (DAB) chairman.

Ekrem also has comprehensive practical knowledge of all forms of delay analysis, specialising in the ‘Windows’ and ‘Time Impact Analysis’ methods; predominantly in circumstances where previous submissions based on other forms of analysis were not persuasive or successful. He is adept with all forms of planning software and has experience with a wide range of programmes used to effectively manage construction projects.

Ekrem’s broad experience spans the fields of project management, project controls, contract management, claims management, forensic delay analysis and various forms of dispute resolution. He has worked on projects in Turkey and across Asia, Europe and the Middle East including high-profile oil and gas, civil engineering, building and transportation projects.

Ekrem is fluent in both Turkish and English. He conducts various seminars on issues ranging from delay analysis, risk allocation under domestic and international forms of contract, and the assessment of entitlement to additional payment in the context of delay and changed circumstances.  Ekrem is a fellow of the Chartered Institute of Arbitrators and the Chamber of Civil Engineers in Istanbul, a practising member of the Academy of Experts and is dual-qualified with an LLM in construction law and arbitration.

Ekrem delivers top-tier service to his clients. He’s one of the most active and versatile professionals out there.

Franco Mastrandrea

Franco Mastrandrea is a Chartered Quantity Surveyor and Chartered Arbitrator with over 40 years of experience in the construction industry. He has acted as expert on more than 50 international project management, delay and quantum-related disputes.

Franco is a leading figure in the field. He is a master in delay and quantum construction matters. Franco is a seasoned expert”
Lexology Index – Arbitration – Thought Leader

From London to Australia and Canada to Antarctica, Franco has extensive and diverse dispute resolution expertise. With an established record in drafting, interpreting and applying commercial terms in contracts, he successfully combines both knowledge and experience under traditional cross-examination and hot-tubbing.

Franco is widely regarded as an expert who is both well qualified and highly experienced in complex construction issues. He is able to identify the key issues of principle in construction appraisal disputes and provide clients with greater clarity as to project performance. Franco combines management, construction and legal knowledge, enabling him to deliver balanced opinions on the performance of those involved in projects, and objective appraisals of the appropriate or likely outcomes.

Franco’s expert commissions cover a wide range of industries including oil and gas in Australia, Canada, Kazakhstan, North Africa and South East Asia; transport infrastructure in the Caribbean and the UK; power generation, from CCGT to windfarms, in the UK; and numerous building and infrastructure projects around the world.

Franco Mastrandrea holds a doctorate that addresses the law, practice and quantification of construction claims. He is a CEDR-accredited mediator, on the RICS register of Dispute Board Members and the FIDIC President’s list of adjudicators, a Chartered Arbitrator, and on arbitrator lists maintained by RICS and international arbitration centres in Dubai, Hong Kong and Singapore. Franco has written extensively on the evaluation of construction claims and is listed in Lexology Index as a “highly respected expert” who is “a really extraordinary witness”.

Franco Mastrandrea is commended as “one of the most experienced thinkers that can be found today in the quantum market”, winning praise for his strategic advice in practical and technical matters.

Derek Nelson

Derek Nelson is a Chartered Quantity Surveyor and Chartered Engineering Surveyor, with over 40 years of construction and engineering experience. He has acted as expert on over 85 occasions in delay, disruption and quantum matters.

Derek is highly methodical and thorough in his approach. Derek is a real force to be reckoned with. Thanks to his experience, he is able to convincingly carry across the most difficult concepts and reasoning to a tribunal.

Lexology Index – Construction – Thought Leader

Derek is both an accredited and certified expert witness, fellow and past chairman of The Academy of Experts and has acted as a delay and quantum expert witness in arbitration, conciliation, litigation and mediation and as an expert determiner. He has been cross-examined on over 25 occasions and has delivered concurrent evidence in disputes from Belize to Brunei and Scotland to Singapore. Alongside his work as an expert adviser for ongoing projects, Derek undertakes the role of ‘project neutral’, independently reviewing international projects in preventative, on-the-job dispute resolution.

In addition to his expert commissions, Derek continues to provide clients with contractual advice, claims preparation and contract administration services on major contracts worldwide. He specialises in the preparation, negotiation and settlement of claims, whether disruption, acceleration or prolongation. Derek delivers advice and procedures to rapidly resolve or avoid disputes in a cost effective and timely manner.

Derek has held senior commercial and contracts positions for major international contractors and owners across Asia, Europe and the Middle East. His expertise includes matters of quantity surveying practice, valuation, damages, contract administration, contract management, commercial management and cost management, which he combines with his tested planning and delay analysis capabilities.

Aside from his extensive accreditations and wide experience, Derek is often called upon to deliver training and seminars on contractual problems, claims preparation, negotiation and dispute resolution. Derek is a contributing author to Delay and Disruption in Construction Contracts, 6th Edition, Chapter 18, Disruption to Progress and Lost Productivity. In October 2018, he was welcomed as a Freeman in the Worshipful Company of Arbitrators.

He has a strong reputation with peers and clients alike and is commended for his “professionalism and thoroughness in evaluation and analysis” as well “the breadth and depth of his experience”. Derek “performs well under cross-examination” according to respondents who praise his “clear and well-researched reports”. The “impressive” Derek Nelson is a “much respected” figure in the market, commended by respondents for his outstanding work dealing with quantum, delay and disruption disputes.  The “highly respected” Derek Nelson is recognised for his “depth and breadth of technical know-how and industry experience” when it comes to complex construction disputes.  Derek Nelson has a broad international practice and impresses peers with his “high- quality reports, well substantiated conclusions and excellent performance under cross-examination”. Derek Nelson “performs well in cross-examinations” and offers “professional and consistently high-quality work” whilst referred to as “usually the quickest to comprehend the crux of a matter and from there he offers and communicates the practical options or solutions”.  Derek is “a gifted quantum expert” that is commended for his “vigilance” during construction disputes. Nelson’s technical background coupled with his “intimate knowledge of international construction law and arbitration hearings” ensure that he is “highly sought after” to testify in disputes.

Derek possesses large experience on construction issues. He is very capable and has great analytical skills. Derek was methodical and precise in his approach as our client’s delay expert.

Michael Tonkin

Michael Tonkin is a Chartered Quantity Surveyor, Chartered Arbitrator, RICS Accredited Expert Witness and CEDR Accredited Mediator with over 35 years of construction industry experience. He is an effective dispute resolver and has acted as quantum expert on more than 70 occasions.

Michael is one of the best construction experts. He has a pragmatic and creative approach to the analysis. He is an excellent quantum expert.

Lexology Index – Construction – Global Elite Thought Leader

Michael has been a party appointed expert witness, a single joint expert witness and a third-party expert evaluator. He has given oral testimony in traditional cross-examination as well as concurrent evidence (hot-tubbing) in international arbitrations, in Asia, Australasia and the Middle East. Michael often acts as ‘coordinating expert’ across several disciplines of expert.

Michael regularly provides commercial advice on formal dispute resolution, dispute avoidance and procurement. He is adept in many of the major standard forms of contract and has been employed by government bodies, large private companies, contractors and subcontractors to advise on commercial matters and procurement.

Michael has extensive experience of commercial negotiations in major projects, particularly where bespoke contracts and innovative methods of procurement have been used. With a background in cost management, he specialises in commercial management, contract management, negotiation, risk management, third party financial reporting and strategic advice. His project experience ranges from major infrastructure and buildings across the Middle East, UK and Asia; power and water in Africa, the Middle East, Asia and Europe; and oil and gas projects in the Middle East and Australasia.

Michael has been appointed as arbitrator on more than 60 occasions (as sole arbitrator, chairman of a tribunal of three, and co-arbitrator) under the auspices of ICC, LCIA, DIAC, ADCCAC and the TAI. He regularly participates in other alternative dispute resolution processes such as adjudication and dispute adjudication boards (DABs). Michael is a trustee and honorary treasurer of the Chartered Institute of Arbitrators and a past chairman and past vice chairman of the UAE branch.

Michael Tonkin is a seasoned quantum expert with over three decades of global experience, known for his sharp commercial acumen, authoritative testimony, and consistent delivery across high-value disputes.

Tim Whealy

Tim Whealy is a Chartered Quantity Surveyor with over 25 years of experience in the construction industry. He supports clients regarding commercial and claims matters, provides lender’s advisory services and has acted as quantum expert on five occasions (including cross-examination in court).

Tim has given evidence in both court and adjudications as quantum expert in the UK. He has fulfilled numerous expert support roles, for complex international construction and engineering disputes and undertaken expert roles for banks, regarding the conduct of bank appointed advisors.

Tim regularly advises on construction related issues and disputes for major projects throughout Saudi Arabia; from oil and gas, power and utilities to buildings and infrastructure. He has led many complex and technically demanding claims assignments across the Middle East region. Tim also has extensive experience in advising contractors, banks and equity funds regarding the identification and mitigation of construction risk.

Tim started his career in contracting before moving to private practice, where he was responsible for a wide variety of new-build and refurbishment schemes across the UK. During this time, he represented clients on a range of quantum based disputes and progressed to the preparation, analysis and submissions of expert witness reports and the defence of contractual claims.

Tim Whealy has presented to various forums on the subjects of construction risk management and common contractual problems, including those relating to FIDIC, JCT and the Saudi Aramco standard form of contract.

Nabil Al Tawil

Nabil Al Tawil is a highly qualified and experienced construction professional with over 40 years of project management, claims and ADR experience. He is one of a small number of accredited Arabic-speaking dispute resolution professionals operating in the UAE and across the Middle East region; and is a registered expert witness with the appeal courts in Iraq.

Nabil Al Tawil is a standout construction manager with over 40 years’ experience in project management, claims, and dispute resolution. He is noted by peers and clients for his “very good understanding of how quantum, delay, and technical disputes are dealt with in the UAE”, solidifying his reputation as a valued asset in the field.

Lexology Index – Consulting – Construction – Quantum, Delay, and Technical

Nabil has been a senior representative to the Abu Dhabi Government Claims Committee for 4 years, significantly enriching his knowledge of the common causes and resolutions of disputed projects in the region. He has been actively involved for several years in arbitration and mediation and has repeatedly acted as sole arbitrator and chair of DRB and arbitration tribunals on cases in Iraq, Abu Dhabi, Dubai, and recently in Sharjah. In addition, Nabil has acted as an expert witness on many occasions and has been cross-examined in litigation and arbitration proceedings

Nabil’s experience covers all aspects of pre-contract and post-contract works, and he has acted as project manager on several major construction projects, such as Sheikh Zayed Grand Mosque in Abu Dhabi. He is well versed in budget management, cost monitoring, value engineering and scheduling for all phases of engineering, procurement, construction and commissioning (EPCC).

Nabil Al Tawil specialises in assessing damages, evaluating contractual entitlement and provides advice and opinion in the course of resolving and settling disputes, through litigation or ADR procedures. He has a wealth of project management and dispute resolution experience, gained through providing arbitration and expert services across a wide range of sectors including power, oil and gas, infrastructure, construction, medical, aviation and military facilities.

In addition to his engineering degree, Nabil holds a PhD from Reading University and an MSc from Loughborough University in construction management. He is a Chartered Construction Manager and a fellow of the Chartered Institute of Building and the Chartered Management Institute, a member of the Chartered Institute of Arbitrators and the Project Management Institute, a RICS accredited mediator, an accredited arbitrator by the Abu Dhabi, Dubai and Sharjah arbitration centres in UAE, and an active member of the Dispute Resolution Board Federation (DRBF) and the International Chamber of Commerce (ICC).

Nabil’s language skills give him a distinct advantage. He handles construction disputes very well.

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