These "registrars" are all doctors who feature in works of literature. Simply identify the authors ("consultants") and use the room numbers to index into the authors' names. This should spell DR ROBINSON.
"Registrar"
Work of literature
Author
Room (index)
Letter
Dr T. J. Eckleburg
The Great Gatsby
FITZGERALD
10
D
Dr H. Wilbourne
The Wild Palms
FAULKNER
8
R
Dr H. Lecter
Red Dragon, The Silence of the Lambs
HARRIS
3
R
Dr J. H. Watson
Sherlock Holmes series
(CONAN) DOYLE
2
O
Dr E. Spindrift
The Doctor is Sick
BURGESS
1
B
Dr J. No
Dr. No
FLEMING
5
I
Dr S. Maturin
Aubrey-Maturin series
O'BRIAN
6
N
Dr A. Woodcourt
Bleak House
DICKENS
7
S
Dr T. Lydgate
Middlemarch
ELIOT
4
O
Dr H. Jekyll
Strange Case of Dr Jekyll and Mr Hyde
STEVENSON
9
N
Author's notes
Author: Dan
This was actually the first puzzle that I wrote for this puzzle hunt! I always wanted the answer to be “HUCKLEBERRY” for the mini-meta of this set, so decided upon a literary-themed medical puzzle (rather than, say, a berry-themed medical puzzle).
Naturally, in order to fit the theme of the rest of this puzzle, I thought it was appropriate to make the puzzle answer the doctor from The Adventures of Huckleberry Finn. Unfortunately, for some reason, Dr Robinson also appears in The Adventures of Tom Sawyer. Even more confusingly, the two Dr Robinsons are actually different characters (spoiler alert: the Dr Robinson in The Adventures of Tom Sawyer actually dies while the Dr Robinson in the sequel The Adventures of Huckleberry Finn does not, so they cannot canonically be the same Dr Robinson). It’s almost like great Mark Twain does not know the name of any other doctors!