[2] She is a regular commentator on legal and constitutional issues for the Australian media.
[4] Twomey has worked for the High Court of Australia as a Senior Research Officer, for the Parliament of Australia as a researcher in the Law and Government Group, and The Cabinet Office of New South Wales as Policy Manager of the Legal Branch.
[6] Twomey was appointed an Officer of the Order of Australia in the 2021 Queen's Birthday Honours, for "distinguished service to the law, to legal education, and to public education on constitutional matters".
[7] Twomey is married to Justice Mark Leeming, a judge on the New South Wales Court of Appeal.
[8][9] In 2022, Twomey started the "Constitutional Clarion" YouTube channel, where she publishes her work for a more general audience.