He studied under Gordon Morgan Holmes, Samuel Alexander Kinnier Wilson and Francis Walshe.

[3] During World War II he was a Consulting Neurologist in the Royal Navy Volunteer Reserve based at HMS Drake.

[4] His contributions to knowledge depended not on technology, but on his power of observation and meticulous dissection of human sensibility and behaviour.

He started a Headache Clinic at King's College Hospital and was one of the founders of the "British Migraine Trust".

Critchley was a handsome and impressive figure, a superb speaker and a lifelong student of the human mind.