The son of Henry Haslam, a "member" or insurance underwriter of Lloyd's of London, he was born in the north London suburb of Hampstead. He was educated at Dover College and in 1889 was admitted to Gonville and Caius College, Cambridge. He took second class in the Natural Sciences Tripos in 1892, and continued his medical training at St Thomas' Hospital in London. He was admitted to the membership of the Royal College of Surgeons in 1896 and received a Bch Cantab degree in 1897.
In 1901 he left St Thomas', having been elected to a scholarship at the Department of Pathology at Cambridge University. He conducted research and published a number of papers in scientific journals. He received a DSc from the university in 1914. He married Julie Henriette Dupont, daughter of Edward Dupont, director of the Musée d’Histoire Naturelle in Brussels, and they had two children.
Haslam subsequently abandoned his medical career, becoming an underwriter at Lloyd's like his father. He also entered politics, and at the 1924 general election he was elected as Member of Parliament (MP) for the safe Conservative seat of Horncastle in Lincolnshire. He held the seat until he retired from the House of Commons at the 1945 general election.
- Craig, F. W. S. (1983) . British parliamentary election results 1918-1949 (3rd edition ed.). Chichester: Parliamentary Research Services. ISBN 0-900178-06-X.
- Leigh Rayment's Peerage Pages [self-published source][better source needed]
- Venn, John (1898). Biographical History of Gonville and Caius College, 1349-1897 2. Cambridge University Press. p. 507.
- "HASLAM, Henry Cobden". Who Was Who. Oxford University Press. December 2007. Retrieved 29 October 2011.
- O'Connor, W J. British physiologists 1885-1914: a biographical dictionary. Manchester University Press. p. 70. ISBN 978-0-7190-3282-0.
- "Deaths". The Times. 9 February 1948. p. 1.
- Hansard 1803–2005: contributions in Parliament by Henry Haslam
|Parliament of the United Kingdom|
|Member of Parliament for Horncastle
John Francis Whitaker Maitland