Judy was a curator at the British Museum (1974 - 2023) specialising in jewellery, and in 19th-20th century decorative arts. Author of Cartier 1900-1939 (BM 1997) and organiser of the Cartier exhibition at the British Museum, co-author of the Catalogue of the Hull Grundy Gift of Jewellery (British Museum 1984), contributor to the Catalogue of Micromosaics in the Gilbert Collection (2000). Her latest book, Jewellery in the Age of Victoria, co-authored with Charlotte Gere, was published in 2010 and won the 2011 William Berger Prize for British Art History. She is a Freeman of the Goldsmiths' Company and a Fellow of the Society of Antiquaries.