Sir William Castell, one of the most high-profile members of Britain's biotechnology sector who masterminded the sale of Amersham to General Electric of the US, is retiring this week.
Sir William, who is 58, became head of GE Healthcare when he sold Amersham to the US giant in 2004. He will retain a seat on GE's board and also become chairman of the Wellcome Trust, the high-profile medical charity.
Amersham, named after the Buckinghamshire town where it was based, was Margaret Thatcher's first privatisation in 1982, when it was spun out from the Atomic Energy Authority. Amersham was valued at £71m at its flotation price.
Sir William joined the company in 1989 and steered it through a number of transformational deals, ending in a sale for almost £6bn to GE.
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