Feldberg was subsequently offered a place in Australia, at the behest of Charles Kellaway, director of the Walter and Eliza Hall Institute of Medical Research.

This work developed into a study of tissue responses to direct and indirect insult, focusing particularly on the liberation of histamine and other endogenous mediators.

Although Feldberg had earned a fellowship supported by the Australian National Health and Medical Research Council, in 1938 he was offered a readership in physiology at Cambridge University.

[3] Feldberg's career was ended in 1990 when two animal rights activists gained access to his lab on the pretence of writing a biography and filming an educational video.

One of the animal rights activists involved, Melody MacDonald, detailed her claims in her 1994 book Caught in the Act: The Feldberg Investigation (ISBN 1-897766-05-X).

These experiments took place at the National Institute for Medical Research laboratories, Mill Hill, in London, which relate to the functions and decisions of the Home Department.