[2] Eastman was educated at Loreto College, Normanhurst, before obtaining her Bachelor of Arts/Bachelor of Laws from the University of New South Wales (UNSW).
She also holds a Diploma of International Human Rights Law from the European University Institute, Florence Italy.
[3] Eastman has practised as a barrister in Sydney in the areas of human rights, discrimination, employment and administrative law since 1998.
[8] In 1998 she was the only Australian NGO representative accredited to participate in the UN negotiations for the establishment of the International Criminal Court in Rome.
[13] In the 2021 Queen's Birthday Honours Eastman was appointed a Member of the Order of Australia for "significant service to the law, to human rights, and to professional organisations".