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Gregory Couston

Fax +61.2.9513.2399

Mr. Couston is a commercial disputes/litigation partner. His practice focuses on professional liability, financial institutions and services litigation, property disputes, and contamination/environmental liability issues.

Mr. Couston's clients include the insurers of professionals in various fields – with particular emphasis on lawyers; as well as property companies, financial institutions, Asian trading companies and a multi national oil company.

Mr. Couston is also a trained and practicing mediator.

He delivers proactive dispute management and "outcomes focused" service to his clients.


  • Recognised as one of Australia’s leading insurance lawyers (2012 – 2018) and litigation lawyers (2014/15 – 2018) in Best Lawyers.

Professional/Civic Activities

  • Australian Insurance Law Association member
  • Resolution Institute member
  • Trained mediator
  • Charity/orphanage work in Uganda and India

Speaking Engagements

Mr. Couston frequently presents at liability and risk management seminars and conferences.
  • Defending Federal Court of Australia class actions against professional advisors concerning failed property development schemes/proposals.
  • Acting on a wide range of negligence and Australian Trade Practices claims against solicitors arising from commercial transactions, loans and mortgages, property dealings, development schemes, trusts, wills and the conduct of litigation.
  • Representing the “determinating expert” in Federal Court of Australia proceedings concerning the regulation of credit card charges.
  • Advising on insurance issues concerning the collapse of a New Zealand finance company.
  • Defending multiple claims against a managing agent arising out of a central business district office fire.
  • Defending a Japanese Bank in securities liability claims conducted in USA and Australia; and obtaining "anti-suit"; injunctive relief, preventing the claimants proceeding in both jurisdictions.
  • Conducting injunction proceedings in Australia on behalf of a Chinese trading company – restraining a bank from paying money under a Letter of Credit facility. This dispute involved Australian litigation and Swiss arbitration concerning the underlying issues.
  • Defending litigated claims concerning actuarial and valuation issues between shareholders in a significant insurance company.
  • Advising on insurance issues in liquidation proceedings involving the Westpoint financial collapse. 
  • Advising on professional liability issues - arising out of the liquidation of New Cap Re.
  • Defending an international oil company in a class action by claimants seeking to recover excise tax collected by the oil company (and others), where the High Court of Australia had determined that the excise was unconstitutional. The claim against our client exceeded AUD100 million. The case was part of a major set of proceedings involving oil retailers and tobacco retailers.
  • Defending and managing claims against a major producer of building adhesive products conducted in multiple Australian States involving an allegedly defective swimming pool product.
  • Advising a number of corporate entities (including a major oil company) on management and liability issues concerning pollution incidents and contaminated properties – including dealings with regulators.