Conversation so far:
What was Joseph Rotblat's take on nuclear bombs?
Rotblat felt betrayed by the use of atomic weapons against Japan, and gave a series of public lectures in which he called for a three-year moratorium on all atomic research.
Why did he feel that way?
Rotblat was determined that his research should have only peaceful ends, and so became interested in the medical and biological uses of radiation.
Did he teach his views?
In 1949, he became Professor of Physics at St Bartholomew's Hospital ("Barts"), London.

Question: How long did he teach?
Self-contained rewrite: How long did Joseph Rotblat teach physics at St Bartholomew's Hospital?