After the war, he became the headmaster of the Cambridgeshire High School for Boys and was in this position when Olivia was born. Newton-John's father was an MI5 officer on the Enigma project at Bletchley Park who took Rudolf Hess into custody during World War II. Through her Ehrenberg line, Newton-John was a third cousin of comedian Ben Elton. Her uncle was pharmacologist Gustav Victor Rudolf Born. Olivia's maternal grandfather was German Jewish Nobel Prize–winning physicist Max Born her maternal grandmother Hedwig was the daughter of German Jewish jurist Victor Ehrenberg, and of his Lutheran wife, whose own father, Olivia's great-great-grandfather, was jurist Rudolf von Jhering. Her mother was born in Germany, and had come to the UK with her family in 1933 to escape the Nazi Regime. Her father was born in Wales, to a middle-class family. Newton-John was born on 26 September 1948 in Cambridge, England, to Brinley 'Bryn' Newton-John (1914–1992) and Irene Helene (née Born 1914–2003). Newton-John was an activist for environmental and animal rights causes, and advocated for breast cancer research. Other hit singles include 'If Not for You' and 'Banks of the Ohio' (both 1971), 'Let Me Be There' (1973), 'If You Love Me (Let Me Know)' (1974), 'Have You Never Been Mellow' (1975), 'Sam' (1977), 'Hopelessly Devoted to You' (1978 also from Grease), 'A Little More Love' (1978), and from the 1980 film Xanadu, 'Magic' and 'Xanadu' (with Electric Light Orchestra). Her signature solo recordings include the Record of the Year Grammy winner 'I Honestly Love You' (1974) and 'Physical' (1981) – Billboard Hot 100 highest-ranking single of the 1980s. It features two major hit duets with co-star John Travolta: 'You're the One That I Want' – which is one of the best-selling singles of all time – and 'Summer Nights'.

In 1978, Newton-John starred in the musical film Grease, whose soundtrack remains one of the world's best-selling albums of all time.

With global sales of more than 100 million records, Newton-John is one of the best-selling music artists from the second half of the 20th century to the present. Eleven of her singles (including two Platinum) and 14 of her albums (including two Platinum and four 2× Platinum) have been certified Gold by the Recording Industry Association of America (RIAA). She was a four-time Grammy Award winner whose music career included five number-one hits and another ten top-ten hits on the Billboard Hot 100, and two number-one albums on the Billboard 200 If You Love Me, Let Me Know (1974) and Have You Never Been Mellow (1975). Dame Olivia Newton-John (26 September 1948 – 8 August 2022) was an English-born Australian singer, actress and activist.

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