Tanja Masson-Zwaan is Assistant Professor and Deputy Director of the International Institute of Air and Space Law (IIASL) at Leiden University, The Netherlands, and President Emerita of the International Institute of Space Law (IISL).

She teaches and supervises students at Bachelors, Masters and PhD level, lectures at universities worldwide, carries out research and publishes on a broad range of space law topics. She advised the Dutch Government with regard to the implementation of the Space Activities Act. She attends the annual sessions of the Legal Subcommittee of the UN Committee on the Peaceful Uses of Outer Space as observer.

Tanja is co-founder and member of the Hague International Space Resources Governance Working Group, and was appointed by the Dutch Government as arbitrator for space related disputes at the Permanent Court of Arbitration and as member of the Space Learning Group of ICAO.

She recently co-authored the 4th edition of the book ‘Introduction to Space Law’ (2019). Tanja is an elected member of various professional associations such as the International Academy of Astronautics (IAA), the Académie de l’Air et de l’Espace (AAE), and the International Law Association (ILA). She was a Member of the Founding Boards of the European Centre for Space Law (ECSL) and of Women in Aerospace-Europe. She serves as advisor to Secure World Foundation (SWF) and is an Honorary Board Member of Space Generation Advisory Council (SGAC). She is a member of the Board of Editors of Kluwer’s journal Air and Space Law.

Tanja is a recipient of the Distinguished Service Award of the IISL (2001), the Social Sciences Award of the IAA (2008), and the IAF Distinguished Service Award (2015), and is an Honorary Member of the Netherlands Space Society (2018).