He worked with psychiatrist Russell Reid. Later, in partnership with surgeon Trevor Crofts, Dalrymple practiced privately at London Bridge Hospital.
He performed over 2000 mtf transgender surgeries before he retired in the early 2000s.
Patients include: Bibíana Fernández, Zagria.
*Not any of the Viscounts of Stair, nor the cricketer, nor the manager of Glasgow Corporation Tramways.
- Russell Reid, Domenico di Ceglie, James Dalrymple, Louis Gooren, Richard Green, John Money. Transsexualism: The Current Medical Viewpoint. Produced for the Parliamentary Forum on Transsexualism, Second Edition, 18th January 1996. PDF
- "James O. Dalrymple". 11 May 2001. www.relativelyyours.com/dalrymple/JamesODalrymple.htm. Archive.