We are sorry to report the death of Jean Aitchison in November 2020 at the age of 95. Jean was a graduate of the UCL History Department, and later a student in the Library School from which she graduated in 1948. Many staff and students in DIS will be familiar with Jean’s ground breaking work on the theory and development of the thesaurus as a retrieval tool, and the use of facet analysis in building controlled vocabularies. She was a true innovator and recognised internationally as a pioneer in the discipline of information science. A fuller obituary can be found on the ISKO-UK website at https://www.iskouk.org/News/9963130.