Since its establishment in September 2003, the International Expert Group on Nuclear Liability (INLEX) has played an important role in raising awareness and understanding of the nuclear liability instruments adopted under the IAEA's auspices. Over the course of the past two decades, the group has advised on many issues related to nuclear liability and reached conclusions and made recommendations on possible gaps and ambiguities in the scope and coverage of the existing instruments. To mark this 20th anniversary, this publication includes papers on several nuclear liability topics and the work of INLEX, contributed by some of the group's current members. The aim of this publication is to increase awareness of the role of INLEX, as well as nuclear liability as an important aspect of nuclear law. The publication is intended for nuclear law professionals, academics and practitioners as well as policy makers.