Baron Brain, of Eynsham in the County of Oxford, is a title in the Peerage of the United Kingdom. It was created on 26 January 1962 for the physician and neurologist Sir Russell Brain, 1st Baronet. He had already been created a Baronet, of Reading in the County of Berkshire, on 29 June 1954. As of 2014[update] the titles are held by his youngest son, the third Baron, who succeeded in that year. He is a retired physician and a former Professor of Medicine at McMaster University, Canada.
Barons Brain (1962)
- (Walter) Russell Brain, 1st Baron Brain (1895–1966)
- Christopher Langdon Brain, 2nd Baron Brain (1926–2014)
- Michael Cottrell Brain, 3rd Baron Brain (b. 1928)
The heir apparent is the present holder's son the Hon. Thomas Russell Brain (b. 1965)
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