Dr Cassandra Steer is Chair and founder of the Australasian Centre for Space Governance. Globally recognised for her expertise in space governance, space law, and space security, she has published widely on these topics, including the application of the law of armed conflict and use of force in outer space. Her book War and Peace in Outer Space (co-edited with Matthew Hersch) has been cited as very useful for military and government practitioners, and the podcast she hosts, titled Space Matters, has been cited as instructive by senior international arms control diplomats. 

Dr Steer has consulted on space law and space security issues to the United Nations Institute for Disarmament Research, the Australian, Canadian and U.S Departments of Defence, the Australian Space Agency and Australian Department of Foreign Affairs and Trade. She has taught space law and space security at McGill University, the ANU College of Law, the ANU National Security College and the Australian Defence College.

Dr Steer is multilingual, and has lived and worked in five countries, in a range of educational, non-profit and public institutions. She has degrees in philosophy, civil law, international law, international criminal law, and training in common law, comparative law and space law.