Amber O’Brien is a senior associate in the Insurance & Reinsurance practice of the London office. Prior to joining Mayer Brown in 2011, she worked in the Insurance & Risk team at a top-tier national firm in Melbourne, Australia. Amber is dual qualified; she is admitted as a solicitor in England & Wales and Victoria, Australia.

Amber has extensive experience advising insurers and policyholders on policy coverage matters, particularly in the context of directors’ and officers’ insurance, financial institutions and professional indemnity. She regularly advises on issues such as non-disclosure, breach of warranty, aggregation, attachment, conditions precedent and the application of policy exclusions. Her D&O practice includes advising insurers on claims brought against directors of multi-national companies, as well as claims against the companies themselves, which often involve complex allocation of loss issues. To compliment Amber’s D&O practice, she was seconded to the D&O claims team at a London market insurer for a period in 2014.

Amber’s financial lines practice includes advising insurers on complex first party and third party losses involving banks, stockbrokers, investment managers and managed funds. She regularly acts on matters with an international element and has been involved in a number of cross-boarder and multi-jurisdictional disputes. Amber also handles political risk and trade credit matters and she has experience advising on risks in Ecuador and Iraq.

Amber also has broad commercial dispute resolution experience with a particular focus on defending complex, high value professional indemnity claims. She acts for a wide range of professionals in the United Kingdom and off-shore, including accountants, trustees, fund administrators, fund managers, barristers and solicitors. Amber is currently representing an off-shore fund administrator in High Court proceedings involving a complex, high value, multi-party professional negligence dispute.

In addition to Amber’s experience as a coverage lawyer and defending professional negligence claims, she also has experience assisting insurers on policy reviews and drafting policy wordings, most notably D&O wordings, as well as advising on insurance regulatory issues for UK and European insurers, as well as Australian captive insurers.

Areas of Focus


Spoken Languages

  • English


La Trobe University, LLB (First Class Honours)

La Trobe University, BBS


  • England and Wales
  • Australia, Victoria


  • Federal Court of Australia
  • High Court of Australia