The Assistant Directors were:
- Stanley Casson: 1920-23. [DBC]
- Walter Abel Heurtley: 1923-33. [DBC]
- Romilly James Heald Jenkins: 1933 (Senior Student). [Obituary: The Times 9 October 1969]
- Arthur Hubert Stanley ('Peter') Megaw: 1934 (Senior Student and Librarian); 1935-36. [Obituary: The Times 4 August 2006]
- Thomas James Dunbabin: 1936-46 (Deputy Director from 1939). [DBC]
Oxford: Casson, Dunbabin.