[5] He continued his post-doctoral studies at the University of Washington, Seattle, 1954–1956, and at the John Curtin School of Medical Research, Australian National University, Canberra, 1956-1958 after which he returned to the UK as Senior Principal Scientist Research Office at Babraham Institute, Cambridge.
[4] He gained worldwide recognition early, clarifying the role of chemical control processes in the brain.
He found a key role of cellular calcium ions in the regulation of membrane permeability for potassium.
In 1981, the publication Current Contents called Krnjevic one of the 1,000 most cited contemporary scientists and named three of his papers "citation classics."
He was a chief editor of the Canadian Journal of Physiology and Pharmacology, and published over 200 scientific articles and about 100 book chapters.