Background
Born at Magdala House, Terriers, High Wycombe, Buckinghamshire, de Havilland was the second son of The Reverend Charles de Havilland (1854–1920) and his first wife, Alice Jeannette (née Saunders) (1854–1911).
Born at Magdala House, Terriers, High Wycombe, Buckinghamshire, de Havilland was the second son of The Reverend Charles de Havilland (1854–1920) and his first wife, Alice Jeannette (née Saunders) (1854–1911).
He was educated at Nuneaton Grammar School, St Edward's School, Oxford and the Crystal Palace School of Engineering (from 1900 to 1903).
Built with money borrowed from his maternal grandfather, de Havilland's first aircraft took two years to build before he crashed it during its first very short flight at Seven Barrows near Litchfield, Hampshire in December 1909. He built a fresh biplane, making his first flight in it from a meadow near Newbury in September 1910. A memorial plaque presently marks the event. Subsequent designs were even more successful: in 1912 he established a new British altitude record of 10,500 feet (3.2 km) in an aircraft of his design, the B.E.2. Geoffrey was the designer and his brother Hereward was the test pilot.
In December 1910, de Havilland joined HM Balloon Factory at Farnborough, which was to become the Royal Aircraft Factory. He sold his second aeroplane (which he had used to teach himself to fly) to his new employer for £400. It became the F.E.1, the first aircraft to bear an official Royal Aircraft Factory designation. For the next three years de Havilland designed, or participated in the design of, a number of experimental types at the "Factory". He was commissioned a second lieutenant (on probation) in the Royal Flying Corps on 2 September 1912, was appointed a reserve officer in the RFC on 24 November and was confirmed in his rank on 25 December.
In December 1913, de Havilland was appointed an inspector of aircraft for the Aeronautical Inspection Directorate. Unhappy at leaving design work, in May 1914 he was recruited to become the chief designer at Airco, in Hendon. He designed many aircraft for Airco, all designated by his initials, DH. Large numbers of de Havilland-designed aircraft were used during the First World War, flown by the Royal Flying Corps and later the Royal Air Force. de Havilland continued to serve in the RFC during the war. On 5 August 1914, he was promoted to lieutenant and appointed a flying officer in the RFC from the same date. On 30 April 1916, he was promoted to captain and appointed a flight commander.
His employer, Airco, was bought in early 1920 by armaments group Birmingham Small Arms Company but discovering it was less than worthlesss BSA shut down Airco in July 1920. With the help of former Airco owner George Holt Thomas he formed de Havilland Aircraft Company employing some former colleagues. Pleased and impressed by the aircraft they built for him Alan Butler, thereafter company chairman, provided the capital to buy premises and then the airfield at Stag Lane Aerodrome, Edgware, where he and his colleagues designed and built a large number of aircraft, including the Moth family. In 1933 the company moved to Hatfield Aerodrome, in Hertfordshire. One of his roles was as test pilot for the company's aircraft. He was believed to have said "we could have had jets" in reference to the ignoring of jet engine possibilities prior to the start of the 1939–45 world war. His company's aircraft, particularly the Mosquito, played a formidable role in that war. In 1944 he bought out his friend and engine designer Frank Halfords engine design consultancy company, forming the de Havilland Engine Company with Halford as head. Halford had previously designed a number of engines for de Havilland, including the de Havilland Gipsy and de Havilland Gipsy Major. Halford's first gas turbine design entered production as the de Havilland Goblin powering de Havilland's first jet, the Vampire.
De Havilland controlled the company until it was bought by the Hawker Siddeley Company in 1960. His financial backer, Alan Butler remained a very involved chairman until he retired in 1950.
In 1909, Geoffrey de Havilland married Louise Thomas, who had formerly been governess to de Havilland's sisters. They had three sons. Louise suffered a nervous breakdown following death of sons and died in 1949. Geoffrey de Havilland remarried in 1951, to Joan Mary Frith (1900-1974). They remained married until his death.