Yoony advises on a wide range of complex commercial disputes and has acted for clients in the banking, energy, insurance, information technology and telecommunications sectors.  She has particular experience in directors’ duties, large-scale contract and tort disputes and urgent injunctive relief. Yoony has represented clients in civil proceedings and regulatory prosecutions, appearing in mediations, courts and arbitrations.

Prior to joining Gilbert Walker, Yoony was a senior litigation associate at MinterEllisonRuddWatts.


  • LLB (Hons) / BCom (Hons, Accounting, 1st class) (Auckland)

  • LLM (Auckland)

  • Admitted to the Bar in 2014


  • acting for a listed pharmaceutical company in a contractual dispute relating to development of a new pharmaceutical drug

  • acting for a defendant in the Whakaari/White Island WorkSafe prosecution following the 2019 eruption

  • advising on internal investigations by the Financial Markets Authority relating to the Financial Markets Conduct Act 2013

  • acting for a multinational petroleum company seeking freezing and ancillary orders against respondents located in New Zealand

  • acting for an IT solutions company in a contractual dispute with a healthcare services provider

  • acting for a listed telecommunication provider in arbitral proceedings against its former contractors for breaches of equitable, contractual and fiduciary duties

  • acting for a listed energy company in arbitral proceedings regarding tax liabilities under a gas supply agreement

  • advising a multinational professional services firm in claims involving an IT subcontractor and the New Zealand Government for breaches arising from delivery of a human resources information management system for a government agency

  • acting for a major insurer in arbitral proceedings with its former IT systems provider in relation to the provision of an IT solution

  • acting for a bank and its appointed receivers in relation to the receivership of a rural feed

  • acting as junior counsel for the liquidators of Mainzeal in the High Court proceedings

  • acting for a large retailer in proceedings brought by the Commerce Commission