William Clerke is a South African qualified lawyer and senior associate in the Construction & Engineering group of the London office. He has substantial experience across a broad range of dispute resolution including litigation, arbitration, mediation and adjudication. He advises clients, which include employers, contractors, sub-contractors insurers and consultants in relation to disputes concerning matters such as defective works, delays, final accounts and professional negligence under a variety of forms of construction contracts.

William has broad international experience and has advised in relation to large construction projects in Europe, the Middle East, the Caribbean, and Sub-Saharan Africa. He has a particular interest in renewable energy projects. He has worked on various high profile and complex cases under different arbitration rules including ICC and LCIA rules and also on matters before the High Court.

William joined Mayer Brown in 2016 as an associate and was made up to senior associate in 2018. Prior to that, he worked at an international law firm in Johannesburg and Cape Town, South Africa.

Spoken Languages

  • English


  • Representing one of the world's leading engineering, procurement, construction and project management companies in an international ICC arbitration with a state-owned petroleum company in relation to the construction of an oil refinery in the Caribbean.
  • Representing the design and build contractor and its professional indemnity insurers on a number of disputes relating to the design of a number of waste to energy facilities – part of the Manchester Waste PFI project
  • Representing the design and build contractor in a dispute relating to the design and construction of a shopping centre in Stoke-on-Trent under the JCT form of contract.
  • Representing an international sponsor/developer in a complex multi-party litigation relating to the construction of two solar PV projects that form part of the renewable energy programme in South Africa. The dispute related to on demand guarantees, letters of credit (urgent high court applications) and the termination of two FIDIC EPC sub-contracts (private ad hoc arbitration) as well as cross-border insolvency issues.
  • Representing a developer and its insurers in a professional negligence dispute with various subcontractors in relation to a fire that occurred during the construction of a hospital in South Africa.
  • Representing a local developer and its insurers in relation to design defects that occurred during the construction of a waste management facility.
  • Representing a developer and its insurers in dispute with various sub-contractors in relation to a fire that destroyed a paper factory in South Africa, which also killed 13 workers.


  • South Africa