Ia Cecilia McIlwaine FSA (20 April 1935 – 24 August 2019) (née Thorold) was a British librarian and Emeritus Professor of Library and Information Studies at University College London.
Michael Herbert Thorold (1904–1956), MA, vicar of St John the Baptist, Bathwick, Somerset, and Dorothy, daughter of George Patrick Henfrey, of Chesham Place, Brighton, East Sussex.
Her father descended from the book collector and politician Sir John Thorold, 9th Baronet through his second son, and was from a line of several generations of clergymen.
[1] She was promoted to Senior Lecturer at UCL in 1985 and then to Reader in Classification and Indexing in 1995 before, in 1997, attaining a Chair of Library & Information Studies.
[1] In 1988 McIlwaine published her PhD these as a two-volume book titled Herculaneum: A Guide to Printed Sources, which ran to over 1,000 pages of content.