However, the geneticist Stephen Oppenheimer carried out an extensive research of the British Isles, finding that the Celtic and Anglo-Saxon influx had little effect, with the majority of British ethnicity tracing back from an ancient Palaeolithic Iberian migration, now represented by the Basques so that 75% of the modern British population could (in theory) trace their ancestry back 15,000 years.
The theory that Austronesians in Southeast Asia arrived from China through Taiwan has been challenged by Stephen Oppenheimer who suggested that many cultures including the people of China and India might have actually originated from Sundaland.
From 1979 he moved into medical research and teaching, with positions at the Liverpool School of Tropical Medicine, Oxford University, a research centre in Kilifi, Kenya, and the Universiti Sains Malaysia in Penang.
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