[6] He studied at St Bartholomew's Hospital ("Bart's") in London, where he signed on in December 1858, becoming a Member of the Royal College of Surgeons in June 1861.

[7] Also in the late 1860s Marsh became surgeon to the Queen Square House of Relief for Children with Chronic Disease of the Joints,[3] an establishment founded "in great part through the exertions of Miss Perceval".

[8] In 1903 Marsh was appointed Professor of Surgery at Cambridge University[1] in belated succession to Sir George Murray Humphry (who had died in 1896).

[2] As Master of Downing College Marsh resisted government pressure to restrict access for students from India, then an important British Colony.

[2] After consulting with fellow members of the college governing body Marsh politely rejected the British minister's request to restrict admissions in a way which would have been "a rebuff to Indian students".