Early Life and Education
- Born in Liverpool in 1881
- Attended Thetford Grammar School
- Studied at Victoria University (UK)
- Obtained L.D.S.R.C.S. degree from University of Liverpool School of Dentistry in 1903
- Appointed Dental House Surgeon at Royal Liverpool University Hospital

Career and Contributions
- Practiced in Southport, Lancashire
- Traveled to the USA and obtained dental degree from Pennsylvania College of Dental Surgery
- Graduated from Angle School of Orthodontia in 1905
- Worked with George Northcroft for 2 years
- Established his own orthodontic practice in 1921

Awards and Positions
- President of the British Dental Association in 1934
- President of the Royal Society of Medicine, Odontological Section in 1943
- President of the European Orthodontic Society in 1938
- Secretary (1910–1925), President (1925–1952), and Honorary Treasurer (1942–1952) of the British Society for the Study of Orthodontics
- Faculty member at Barts and The London School of Medicine and Dentistry for 40 years

Contributions to Orthodontics
- First person in England to solely practice orthodontics
- Organized the first postgraduate course on orthodontics in England
- Awarded Faculty of Dental Surgery by the Royal College of Surgeons of England in 1947
- Played a significant role in the development of orthodontics in Europe
- Made important contributions to the understanding of etiology in orthodontic cases

References
- British Orthodontic Society Museum and Archive - History of Orthodontics - Key Figures - Harold Chapman (source: www.bos.org.uk)
- American Journal of Orthodontics (C. V. Mosby, 1915)
- Wilson, Herbert Edward (1966) - 'Harold Chapman' - American Journal of Orthodontics, 52(6): 454–459
- Phulari, Basavaraj Subhashchandra (2013) - 'History of Orthodontics' - JP Medical Ltd. - ISBN 9789350904718
- Chapman, Harold (1927) - 'Etiology in Orthodontic Cases' - The Journal of the American Dental Association, 14(11): 2046–2056