Prior to being called to the bar in 2019, Katherine retained the carriage of a variety of complicated matters for the (now) Minister for Home Affairs, including:
- Appeals by the Minister raising issues concerning the construction of the procedural code governing the Immigration Assessment Authority, and the application of legal unreasonableness to the Authority's discretionary powers: Minister for Immigration & Border Protection v CRY16 (2017) 253 FCR 475; Minister for Immigration & Border Protection v DZU16 (2018) 253 FCR 526.
- Proceedings challenging the legality of a Practice Direction of the Immigration Assessment Authority, in which Katherine appeared as solicitor advocate: DGZ16 v Minister for Immigration & Anor  FCCA 623; appeal dismissed DGZ16 v Minister for Immigration and Border Protection  FCAFC 12; (2018) 258 FCR 551.
- Numerous matters in the courts and Administrative Appeals Tribunal lodged by a litigant raising issues in relation to Australian citizenship and the cancellation of approval of citizenship, character, the Freedom of Information Act 1982 (Cth), Archives Act 1983 (Cth) and Privacy Act 1988 (Cth), the conduct of Commonwealth public servants, vexatious proceedings, and inquiries by the Commonwealth Ombudsman.
- A matter concerning the construction of Article 33(2) of the Refugees Convention: SZOQQ v Minister for Immigration and Citizenship (2013) 296 ALR 409.
- Instructing the Solicitor General of Australia in proceedings before the High Court of Australia, including a successful appeal by the Minister in a matter involving whole of Commonwealth implications: Minister for Immigration and Citizenship v SZJSS (2010) 243 CLR 164.
- Instructing Senior Counsel (Stephen Gageler SC, now a Justice of the High Court of Australia) on behalf of the Minister: SZFDV v Minister for Immigration and Multicultural and Indigenous Affairs (2007) 233 CLR 51.
Katherine has represented various State and Federal government agencies and Ministers in judicial and merits review proceedings, including, for example Chief of Navy v Angre  FCAFC 171. She has provided advice and representation to the Commonwealth of Australia in claims for damages arising out of alleged unlawful detention.
Katherine worked as solicitor assisting Counsel assisting the Royal Commission into Institutional Responses to Child Sexual Abuse, and assisted the Review Leaders on the Australian Defence Force Review of Allegations of Sexual and Other Abuse in Defence.
As a solicitor prior to being called to the bar, Katherine had regular conduct of litigation in the range of Commonwealth Courts including the High Court and Full Federal Court. She has had extensive experience appearing as a solicitor advocate in the Federal Court, Federal Circuit Court and Administrative Appeals Tribunal.
Katherine is enthusiastic about giving practical and timely advice that addresses the needs of her clients and about maximising efficiency through the innovative use of information technology.
In 2016, 2017, 2018 and 2019, Katherine was named as one of the AFR's best lawyers in Australia in the categories of Government Practice and Immigration Law.