Gillies was born in Dunedin, New Zealand. He studied medicine at Gonville and Caius College, Cambridge University, where despite a stiff elbow sustained sliding down the banisters at home as a child he was a rowing blue and participated at the 1904 Boat Race.
World War I
Following the outbreak of World War I he joined the Royal Army Medical Corps. Initially posted to Wimereux, near Boulogne, he acted as medical minder to a French-American dentist, Valadier, who was not allowed to operate unsupervised but was attempting to develop jaw repair work. Gillies, eager after seeing Valadier experimenting with nascent skin graft techniques, then decided to leave for Paris, to meet the renowned surgeon Hippolyte Morestin. He saw him remove a tumour on a patient's face, and cover it with jaw skin taken from the patient. Gillies became enthusiastic about the work and on his return to England persuaded the army's chief surgeon, Arbuthnot-Lane, that a facial injury ward should be established at the Cambridge Military Hospital, Aldershot.
This rapidly proved inadequate and a new hospital devoted to facial repairs was developed at Sidcup. The Queen's Hospital opened in June 1917 and with its convalescent units provided over 1,000 beds. There Gillies and his colleagues developed many techniques of plastic surgery; more than 11,000 operations were performed on over 5,000 men (mostly soldiers with facial injuries, usually from gunshot wounds). The hospital, later to become Queen Mary's Hospital, was at Frognal House (the birthplace and property of Thomas Townshend, Lord Sydney after whom Sydney, Australia was named).
For his war services Gillies was knighted in the Birthday Honours list of June 1930. William Arbuthnot-Lane commented, "Better late than never".
Between the wars Gillies developed a substantial private practice with Rainsford Mowlem, including many famous patients, and travelled extensively, lecturing, teaching and promoting the most advanced techniques worldwide.
In 1930 Gillies invited his cousin, Archibald McIndoe to join the practice, and also suggested he apply for a post at St Bartholomew's Hospital. This was the point at which McIndoe became committed to plastic surgery, in which he too became pre-eminent.
World War II
During World War II Gillies acted as a consultant to the Ministry of Health, the RAF and the Admiralty. He organised plastic surgery units in various parts of Britain. His own work continued at Rooksdown House, part of the Park Prewett Hospital, Basingstoke. During this period, and after the war, he trained many doctors from Commonwealth nations in plastic surgery.
Pioneering sex reassignment surgery
Instead of retiring at the end of the Second World War Gillies had to keep working as he had insufficient savings.
In 1946, he and a colleague carried out one of the first sex reassignment surgery from female to male on Michael Dillon. In 1951 he and colleagues carried out one of first modern sex reassignment surgery from male to female using a flap technique on Roberta Cowell, which became the standard for 40 years.
Gillies made a visit to New Zealand in 1956 after an absence of 51 years.
Gilles suffered a slight cerebral thrombosis while undertaking a major operation at the age of 78 on the damaged leg of a 18 year old girl on 3 August 1960. Gillies died on 10 September 1960 at the London Clinic, at 20 Devonshire Place, Marylebone. Despite earning an estimated ₤30,000 a year between the First and Second World Wars he left an estate of only ₤21,161.
Gillies married Kathleen Margaret Jackson on 9 November 1911, in London. They had four children. His eldest son, John Gillies, flew Spitfires with 92 Squadron R.A.F. in World War 2. John Gillies was shot down over France on 23/05/40, and became a POW for the duration of the war. His youngest son Michael Thomas Gillies followed his father into medicine.
In addition to his career as a surgeon, he was also a champion golfer and inveterate practical joker. For many years his home was at 71 Frognal, in the heart of London's Hampstead village. A blue plaque on the front of that house now commemorates his life and work.
Actor Daniel Gillies is his descendant.
- Gillies HD. Plastic Surgery of the Face. Henry Frowde. 1920, 1983. ISBN 0-906923-08-5
- Gillies HD, Millard DR. The Principles and Art of Plastic Surgery. Butterworth. 1958.
- Davis, A. D. (1957). "The Principles and Art of Plastic Surgery". California Medicine 87 (1): 67. PMC 1512094.
- "Walter Ernest O'Neil Yeo - One of the first people to undergo Plastic Surgery". The Yeo Society. 28 August 2008.
- Mary Roach (18 March 2007). "Girls Will Be Boys". New York Times. Retrieved 25 March 2007.
- Meikle. Page 196.
- Meikle, Murray C. (2013). Reconstructing Faces: The Art and Wartime Surgery of Gillies, Pickerill, McIndoe and Mowlem (HARDBACK). Dunedin: Otago University Press. ISBN 978-1-877578-39-7.
- Pound R. Gillies: Surgeon Extraordinary. Michael Joseph. 1964.
- Slevin, Tom. ‘The Wound and the First World War: ‘Cartesian’ Surgeries to Embodied Being in Psychoanalysis, Electrification and Skin Grafting’ in Body and Society (Volume 14, No.2 2008) pp. 39–61.
- Miranda Seymour, "Carrying on", New York Times (Sunday Book Review), 23 Jul 2010.
- "Harold Gillies – Aesthetic Reconstructor". NZ Edge. Retrieved 20 February 2009.
- "Gillies Archives". Queen Mary's Hospital, Sidcup. Retrieved 20 February 2009.
- "Harold Gillies (1882-1960)". Surgical Tutor. Retrieved 20 February 2009.
- "Project Facade". Retrieved 20 February 2009.
- "Harold Delf Gillies, plastic surgeon (1882-1960)". WW2 People's War Archive. BBC. Retrieved 25 March 2007.
- "Gillies, Harold Delf (1882-1960)". Dictionary of New Zealand Biography. Retrieved 25 March 2007.
- Kennedy, Pagan (18 March 2007). "'The First Man-Made Man' (first chapter)". New York Times. Retrieved 25 March 2007.