A first transfer was made in May 2015 by Silvia Fano, Cassese's wife.
A second transfer was made in early 2022 with a contract of deposit signed by Silvia Fano and Paola Gaeta, Graduate Institute of International and Development Studies, Geneva (where the files had been stored) and Dieter Schlenker on behalf of the HAEU, in February 2022.

The material present in this fonds reflects Antonio Cassese's professional career as researcher, professor of international law, legal expert on human rights and judge in important international courts of law. The material collected throughout his career comprises various types of documents, including official statements, papers, legal opinions, as well as administrative documents describing the various positions held by A. Cassese. A third of the fonds consists of correspondence, which provides information on Cassese’s personal and professional relationships and on the cultural context in which he worked. The fonds also includes interviews and press articles written by Cassese that shed light on Cassese’s opinions and thoughts. The fonds also comprises photos, audio cassettes and DVDs, related mainly to conferences, seminars and interviews.
In the second transfer of 2022, the Historical Archives of the EU received Cassese's files concerning the international tribunals to which he contributed.

The original file arrangement has been widely maintained. The correspondence has been kept in the original order; organised in different ways (according to addresses, subjects and senders). The documents concerning his professional career have been arranged by topic in order to keep every document in its context and to facilitate consultation, respecting as much as possible the provenance principle. The series "press articles" has been organised mainly according to authors, newspapers and in chronological order.

Academic utilisation and partial reproduction (in the form of photocopies or digitalized photographs only) of the documents is authorized in accordance with the provisions in force at the HAEU.

Arabic, Dutch, English, French, German, Spanish

Artifact, Audio, Photograph, Textual, Video

The documents are generally in very good condition.

I have removed some sensitive documents from files until further notice. I have also closed some files until 2050 particularly those concerning the ICTY, the STL and the ICTR.

The fond contains some articles written by Cassese and translated for several international newspapers from Albania, Czech Republic, Finland, Qatar, Montenegro, Serbia, Slovakia, Slovenia etc. Therefore, with these exceptions, there are other languages in addition to the languages referred to above.