Percy Arthur Barnett (1858-1942) grew up in the Jews' Hospital and Orphan Asylum, Norwood. As well as being a member of The London Library, he was a teacher and educational theorist, and was sent to oversee the reorganization of the education system in Natal following the Boer War.
Claude Joseph Goldsmid Montefiore was a member of the Anglo-Jewish elite who broke with Jewish orthodoxy when he founded Liberal Judaism in Britain. He died "disappointed and embittered" at the relative failure of Liberal Judaism, which he blamed on the rise of Zionism. After his death in 1938 The London Library received a bequest of all the pamphlets (around 5,000 titles) he had collected in the course of his life.